Pure K Flagship Course

Home Food Business Crash Course

Fifty short lessons that take you from the three categories of food all the way through kashering, tevilas keilim, checking produce, challah, yoshon, Shabbos, and Pesach — each with a video and a full written class built on primary sources.

12 MODULES  ·  50 LESSONS  ·  ~5 MIN EACH  ·  LESSONS 1–11 LIVE NOW

How this course works

Short and in order. Each lesson is about five minutes. They build on each other, so the early modules teach the concepts the later, practical ones assume — take them start to finish.

Video plus a written class. Every lesson pairs a short video with a full written class in plain English, so you can watch, read, or both.

Primary sources only. Each written class ends with its mekoros — Chumash, Gemara, Rishonim, Shulchan Aruch, and the poskim — so you can see exactly where every point comes from.

A question for your rav, not a ruling. These lessons teach the concepts and represent machlokes fairly; they don’t decide your case. Turn each one into a question for the rav whose rulings you follow. We recommend certification for any food business.

The full curriculum

Twelve modules, fifty lessons. Lessons 1–11 are live now — the rest are being added.

Module 3 · Coming soon

Taste Transfer & Kashering

  • 12. Ta’am and bliyos: how utensils absorb and release taste
  • 13. Nat bar nat: secondary taste
  • 14. Ben yomo, the 24-hour rule, and nosen ta’am lifgam
  • 15. Kashering I — Hagalah
  • 16. Kashering II — Libun and the self-clean oven
  • 17. Kashering III — Irui, glass, and materials that can’t be kashered
  • 18. Kashering everyday tools
  • 19. Ovens, ranges, and baking equipment in practice
Module 4 · Coming soon

Tevilas Keilim

  • 20. Tevilas keilim I: the mitzvah, materials, and the bracha
  • 21. Tevilas keilim II: appliances and practical logistics
Module 5 · Coming soon

Bishul Akum & Pas

  • 22. Bishul akum I: the prohibition and its two conditions
  • 23. Bishul akum II: bishul Yisroel and Sephardi/Ashkenazi practice
  • 24. Pas akum and Pas Yisroel
  • 25. Pas palter and the Aseres Yemei Teshuvah
Module 6 · Coming soon

Sharp Foods, Frying & Mixtures

  • 26. Davar charif: sharp foods and the knife
  • 27. Cut onions, garlic, and eggs left overnight
  • 28. Frying and shared oil
  • 29. Bitul: nullification and its limits
Module 7 · Coming soon

Insects & Produce

  • 30. The prohibition of eating insects; miut hamatzui
  • 31. Checking produce: leafy greens, broccoli, berries
  • 32. Flour, grains, and dried goods: infestation and storage
Module 8 · Coming soon

Ingredients & Sourcing

  • 33. How certification works: the hechsher system
  • 34. Flavors, enzymes, and cultures
  • 35. Grape products: wine, juice, and stam yayin
  • 36. Gelatin, glycerin, and animal-derived ingredients
  • 37. Dairy equipment and protecting pareve integrity
Module 9 · Coming soon

Mitzvos of Dough & Grain

  • 38. Challah I: the mitzvah, the five grains, amounts, bracha
  • 39. Challah II: commercial separation and corporations
  • 40. Chodosh and Yoshon I: the concept and the five grains
  • 41. Chodosh and Yoshon II: crops, the machlokes, sourcing
Module 10 · Coming soon

Produce of Eretz Yisroel

  • 42. Terumos and maasros: tithing produce
  • 43. Orlah and other agricultural mitzvos in your ingredients

Applies mainly to businesses sourcing Israeli-grown produce.

Module 11 · Coming soon

Shabbos & Yom Tov

  • 44. Bishul on Shabbos: the melacha of cooking
  • 45. Chazarah and keeping food warm
  • 46. Amirah l’akum: non-Jewish employees on Shabbos
  • 47. A Jewish-owned business and Shabbos
  • 48. Yom Tov cooking: ochel nefesh and its limits
Module 12 · Coming soon

Pesach & Conclusion

  • 49. Pesach I: chametz ownership, mechiras chametz, kashering
  • 50. Pesach II: kitniyos, chametz she’avar alav haPesach, next steps

Ready to begin?

Start with Lesson 1 and work through at your own pace. When you’re ready to certify a product for market, our rabbinic team is here.