Rip Esselstyn's Sweet Potato & Vegetable Lasagna

onion, chopped

small head of garlic, all cloves chopped or pressed

mushrooms, sliced

head broccoli, chopped

carrots, chopped

red bell peppers, seeded and chopped

corn, rinsed and drained

package firm tofu

cayenne pepper

oregano

basil

rosemary

jars pasta sauce

boxes whole grain lasagna noodles

frozen spinach, thawed and drained

sweet potatoes, cooked and mashed

roma tomatoes, sliced thin

raw cashews, ground