Lieber's Lentil Soup

Acquire:2 cups lentils (brown or green)2 white/yellow onions1 WHOLE BULB of GARLICTomatos or tomato paste- "some"2 potatoesChicken-Style SeitanCumin-to tasteCarrots-1/4 cupPossibly more garlicChopped Spinach- like, a quarter poundThis is what I'm working on while working, trying to duplicate Steve Lieber's Lentil Soup. Which is hard, because Steve's a real cook, which means he doesn't know what