Kashrus Halacha
Rabbi Dovid Cohen
Laws of kosher as they apply in contemporary times, taught by Rabbi Dovid Cohen of cRc Kosher.
Shiurim
- Copepods in New York City Water (Halachos of Insects #2 - Shulchan Aruch 84:2)
Rabbi Dovid Cohen
Copepods in New York City Water Background Moschim and nov'im Three opinions Buy the book at www.kashrushalacha.com
- Greenhouse Produce (Hashgachah Practicum #37 - Insects C)
Rabbi Dovid Cohen
Greenhouse Produce: Methods; Insects; Bracha; Marror. See seforim by Rabbi Cohen at www.kashrushalacha.com
- Kashrus of Medicines (Kosher Classes #38)
Rabbi Dovid Cohen
Kashrus of Medicine Liquids and chewables Edibility Ach’shvei Severity of illness Flavors Gelcaps/Softgel Ingredients Substitutions Decision tree General rules
- Keeping Kosher (Kosher Classes #27)
Rabbi Dovid Cohen
Keeping Kosher
- Methods of Food Preparation [Part 2] (Bishul Yisroel #33 - Shulchan Aruch 113:13)
Rabbi Dovid Cohen
Methods of Food Preparation [Part 2] Smoking Steam Buy the book at www.kashrushalacha.com
- Is It Chametz? (Pesach #43)
Rabbi Dovid Cohen
Is It Chametz? Foods Non-Foods Medicines Pets See Rabbi Cohen's seforim at www.kashrushalacha.com
- Medical Advocates (Kosher Classes 72)
Rabbi Dovid Cohen
Medical Advocates: Your turf; Kashrus knowledge; Placing patients. See seforim by Rabbi Cohen at www.kashrushalacha.com
- "D" and "DE" (Q&A 24)
Rabbi Dovid Cohen
"D" and "DE" Dairy and Dairy Equipment See seforim by Rabbi Cohen at www.kashrushalacha.com
- Tevillah at a Houseware Store (Tevillas Keilim #10 - Shulchan Aruch 120:8)
Rabbi Dovid Cohen
Klei sechorah Jew purchased for non-food use Tevillah before it was required Tevillah at a Houseware store Storekeepers Tevillah after the sale Tevillah for a present Buy the book at www.kashrushalacha.com
- Cheese vs. Butter (Kosher Dairy #21 - Shulchan Aruch 115:3)
Rabbi Dovid Cohen
Milk powder and casein (revision) Cheese vs. butter Cheese from chalav akum Cheese vs. butter
- Shechitah Pen (Meat and Poultry 11 - Shechitah B)
Rabbi Dovid Cohen
Shechitah Pen - History - Shackle and Hoist - Upright ASPCA Pen - Rotating Weinberg Casting Pen Video available at https://kshr.us/ShechitahPen
- Math (Q&A 82)
Rabbi Dovid Cohen
Math See seforim by Rabbi Cohen at www.kashrushalacha.com
- Beverages (Hashgachah Practicum #35 - Consumer E)
Rabbi Dovid Cohen
Beverages: Water; Fruit juice; Grape juice and wine; Soda; Energy drinks; Alcoholic beverages. See seforim by Rabbi Cohen at www.kashrushalacha.com
- Which Foods Might Be Chametz [Part 2 - Halacha] (Pesach #11)
Rabbi Dovid Cohen
Which Foods Might Be Chametz Part 2-Halacha - Tempering of Flour - chametz, matzah - Oats - Bran & Chaff - Koji fermentation, furfural
- Residual Heat (Pas Yisroel #11 - Shulchan Aruch 112:10)
Rabbi Dovid Cohen
Residual heat Like hashlachas kisem Mechaber/Rema How long can it last? Convection (and regular) ovens Buy the book at www.kashrushalacha.com
- Chozer V'Niur (Kashering #36 - Shulchan Aruch 451:27)
Rabbi Dovid Cohen
Glass [Part 2] Chozer v'niur
- Carmine (Halachos of Insects #35 - Shulchan Aruch 84:17)
Rabbi Dovid Cohen
Carmine Binas Adam Minchas Yaakov Shellac Buy the book at www.kashrushalacha.com
- Materials [Part 2] (Tevillas Keilim #2 - Shulchan Aruch 120:1)
Rabbi Dovid Cohen
Materials (Part 2) - Plastic - Cardboard - Paper - Aluminum and other “new” metals - Other materials Buy the book at www.kashrushalacha.com .
- Pesach Shorts [Part 1] (Kosher Anthology 49)
Rabbi Dovid Cohen
Pesach Shorts [Part 1]: Coffee decaffeination; 5-gallon water jugs; Mashgiach visiting bakery on Pesach. See seforim by Rabbi Cohen at www.kashrushalacha.com
- Danger (Q&A 77)
Rabbi Dovid Cohen
Danger See seforim by Rabbi Cohen at www.kashrushalacha.com
- Petrochemicals (Hashgachah Practicum #51 - Ingredients H)
Rabbi Dovid Cohen
Petrochemicals: Introduction (hydrocarbons, nomenclature); Primary chemicals (alkanes, alkenes/olefins, aromatics); Finished products; Renewables. See seforim by Rabbi Cohen at www.kashrushalacha.com
- Davening (Meat and Poultry 6 - Shochet B)
Rabbi Dovid Cohen
- Yiras Shomayim - Is shechitah a mitzvah - Paid to shecht - Sephardim - Break time - Did not daven Video available at https://kshr.us/Davening
- Foie Gras (Meat and Poultry #31 - Specific Parts A)
Rabbi Dovid Cohen
Can Foie Gras be certified as kosher? Four issues to consider: Species Tzaar Baalei Chaim Nekuvas Haveshet Kashering See the video at http://kshr.us/FoieGras https://youtu.be/hzzi6yrIFgA April 9 http://kshr.us/FoieGras
- China and Teflon (Tevillas Keilim #9 - Shulchan Aruch 120:6-7b)
Rabbi Dovid Cohen
China and Teflon Buy the book at www.kashrushalacha.com
- Wine Vinegar (Alcoholic Beverages #33 - 123:6-8)
Rabbi Dovid Cohen
Wine Vinegar - Stam yayin - Berachos Buy the book at www.kashrushalacha.com
- Sirchos of the Lungs (Meat and Poultry 14 - Teraifos A)
Rabbi Dovid Cohen
Sirchos of the lungs - Structure of the lungs - Terminology - Sirchos - Why we check the lungs - Other teraifos Video available at https://kshr.us/Sirchah
- Bee Products (Q&A 66)
Rabbi Dovid Cohen
Bee Products See seforim by Rabbi Cohen at www.kashrushalacha.com
- Dough of a Non-Jew (Hafrashas Challah #26 - Shulchan Aruch 330:1-3)
Rabbi Dovid Cohen
Dough of a non-Jew: Commercial settings Review of the tevel hafrashas challah system
- Creating Bishul Yisroel (Kosher Classes #14)
Rabbi Dovid Cohen
Creating Bishul Yisroel
- Fruit Trees (Q&A 91)
Rabbi Dovid Cohen
Fruit Trees See seforim by Rabbi Cohen at www.kashrushalacha.com
- Performing the Hafrashah (Hafrashas Challah #19 - Shulchan Aruch 328:1)
Rabbi Dovid Cohen
Performing the hafrashah Verbalizing the hafrashah Wording of the bracha Standing for the bracha Designating the challah
- Arlah in Vineyards (Kosher Classes #68)
Rabbi Dovid Cohen
Arlah in Vineyards: Grape growth; Arlah basics; Primary questions; Safek arlah in chutz la'aretz; Atzis she'aino nakuv; Neta revai. See seforim by Rabbi Cohen at www.kashrushalacha.com
- Poultry (Q&A 88)
Rabbi Dovid Cohen
Poultry See seforim by Rabbi Cohen at www.kashrushalacha.com
- Length of Hag'alah (Kashering #17 - Shulchan Aruch 451:9)
Rabbi Dovid Cohen
Length of hag'alah
- Bishul Akum (Kosher Classes #4)
Rabbi Dovid Cohen
Bishul Akum
- Sinning to Save from Sinning (Hafrashas Challah #16 - Shulchan Aruch 325:2)
Rabbi Dovid Cohen
Sinning to save else from sinning (חטא בשביל שיזכה חבירו ) Hafrashah from non-mukaf Seemingly contradictory Gemaros Rishonim’s resolutions Save from shmad Other examples
- Tempering of Wheat - Bonus Material (Kosher Anthology 38)
Rabbi Dovid Cohen
Tempering of Wheat - Bonus Material: Tofeach or Al Minas Lehatfiach? Leratzon; Safek Tumah. See seforim by Rabbi Cohen at www.kashrushalacha.com
- Meat and Fish (Bitul and Blios #13 - Shulchan Aruch 95:1)
Rabbi Dovid Cohen
Meat and Fish Danger Separation Bitul (bitul b'shishim, bitul issur l'chatchilah) Worcestershire sauce Fish oil Marshmallows Fish fork B'lios See seforim by Rabbi Cohen at www.kashrushalacha.com
- Pas Paltar (Pas Yisroel #2 - Shulchan Aruch 112:2)
Rabbi Dovid Cohen
Pas Paltar Heitiru Pas Times to be machmir Buy the book at www.kashrushalacha.com
- Milk From Cows That Ate Chametz (Pesach #17)
Rabbi Dovid Cohen
Milk from cows that ate chametz Kol yamehah Zeh v'zeh gorem What do they eat Peh she'asid Practical application
- Whey [Part 2] (Kosher Dairy #13 - Shulchan Aruch 115:2)
Rabbi Dovid Cohen
Whey (part 2) Cook-water Animal rennet Kashering after non-kosher whey
- Drinks (Q&A 29)
Rabbi Dovid Cohen
Drinks See seforim by Rabbi Cohen at www.kashrushalacha.com
- Dehydrated & Freeze Dried Herbs (Halachos of Insects #30 - Shulchan Aruch 84:12)
Rabbi Dovid Cohen
Dehydrated herbs Freeze Dried Herbs Buy the book at www.kashrushalacha.com
- Coffee on Shabbos (Kosher Classes #22)
Rabbi Dovid Cohen
Coffee on Shabbos
- Coffee On The Road (Kosher Classes #55)
Rabbi Dovid Cohen
Coffee on the road: Starbucks; Rest stops; Convenience stores; Hotel room; Office. See seforim by Rabbi Cohen at www.kashrushalacha.com
- Tevillah on Assorted Utensils (Tevillas Keilim #7 - Shulchan Aruch 120:5b)
Rabbi Dovid Cohen
Storage containers Toaster Blech Sandwich-Maker Immersion Blender Meat Thermometer Flour Sifter Food Scale Immersion Heater Buy the book at www.kashrushalacha.com
- Jew Started The Cooking (Bishul Yisroel #24 - Shulchan Aruch 113:6)
Rabbi Dovid Cohen
Jew Started the Cooking Gemara Rema Buy the book at www.kashrushalacha.com
- Cream of Tartar (Alcoholic Beverages #37 - 123:14-16)
Rabbi Dovid Cohen
Cream of Tartar - Background, - Tartaric acid - Arlah Buy the book at www.kashrushalacha.com
- Beheimah Shehorah Bo Chacham (Kosher Anthology 24)
Rabbi Dovid Cohen
Beheimah Shehorah Bo Chacham / בהמה שהורה בו חכם: Sevara vs. Mesorah; Bitul; Who; Applications. See seforim by Rabbi Cohen at www.kashrushalacha.com
- Science and Kashrus (Kosher Classes 74)
Rabbi Dovid Cohen
Science and Kashrus: Animal fat and vegetable oil (glycerin, fatty acids); Vape juice, e-cigarettes, and flavors; Glucose; Medicine; Vacuum and pressure. See seforim by Rabbi Cohen at www.kashrushalacha.com
- Sefichin for Farmers (Shemittah #11 - Avodas Karka E)
Rabbi Dovid Cohen
Sefichin for farmers - Planted in the sixth year - Grains & kitnios Buy the book at www.kashrushalacha.com
- Requirement to Check Produce (Hashgachah Practicum #32 - Insects A)
Rabbi Dovid Cohen
Requirement to check produce: Miut hamatzui; Defining matzui (surprise, portions); Muchzak b'tolaim; Can't check, already cooked; Smoothies and broccoli kugel. See seforim by Rabbi Cohen at www.kashrushalacha.com
- Water Touching the Entire Utensil (Tevillas Keilim #29 - Shulchan Aruch 202:9)
Rabbi Dovid Cohen
Water touching entire utensil Fully submerged Electric pot and blender Springform pan Pocket knife Buy the book at www.kashrushalacha.com
- Size of Forbidden Insects [Part 1-Questions] (Halachos of Insects #11 - Shulchan Aruch 84:6)
Rabbi Dovid Cohen
Size of forbidden insects (part 1) Questions Whose vision? Visible or iIdentifiable? Mutar or ones? Buy the book at www.kashrushalacha.com
- Bloodspots (Eggs #8 - 86:7-8)
Rabbi Dovid Cohen
Bitul l’chatchilah on a davar pagum Bloodspots - How they form - Halachic status - Non-fertilized eggs - Checking eggs - Protein spots
- Pesach Update 2026 (Pesach #47)
Rabbi Dovid Cohen
Pesach Update: Seltzer; Toothpaste, mouthwash, lipstick; Mouse traps; Water coolers and dispensers (Noam); Vinegar-based cleansers; Corelle. See Rabbi Cohen's seforim at www.kashrushalacha.com
- Bitul of Keilim (Bitul and Blios #41 - Shulchan Aruch YD 102:2-3)
Rabbi Dovid Cohen
Bitul of Keilim: Non-Automatic Heter; Kashering; Expense, other factors; Aino ben yomo; Pesach; Tevillas Keilim. See seforim by Rabbi Cohen at www.kashrushalacha.com
- Kashering of Cheese Equipment (Hashgachah Practicum #50 - Dairy E)
Rabbi Dovid Cohen
Kashering of Cheese Equipment: Cheese tanks; Brining; Cheese wires; Shrink tunnel. See seforim by Rabbi Cohen at www.kashrushalacha.com
- Dairy Bread (Bitul and Blios #24 - Shulchan Aruch YD 97:1)
Rabbi Dovid Cohen
Dairy Bread: Basic halacha; Kashering; Bitul; Which foods; K'ein turah; Timing. See seforim by Rabbi Cohen at www.kashrushalacha.com
- Bishul Yisroel Summary (Kosher Classes #46)
Rabbi Dovid Cohen
Review/summary of the halachos of bishul Yisroel