Last night, our son-in-law, Ron, made Valentine’s Day dinner for Ray, Rachael, Liz, Ethan, and me. Everything he served, except for the lettuce, was completely homemade. This included pita bread, tzatziki (a sauce made with cucumber, yogurt, and parsley), and seitan, a flour-based high-protein meat substitute that was so delicious that you’d never suspect it…