whole-seed-mustard Published September 27, 2012 at 388 × 480 in Making Homemade Lacto-Fermented Whole Seed Mustard and Yoghurt Cream Cheese Whole seed mustard is a base ingredient in many foods. It will be hot as Hades when you first make it but it will mellow in the fridge. Whole seed mustard is a base ingredient in many foods. It will be hot as Hades when you first make it but it will mellow in the fridge.