If youve heard about the Engine 2 Diet and want to try an Engine 2 approved recipe, heres a sample recipe to try. This is Rip Esselstyns Raise the Roof sweet potato vegetarian lasagna. Its so good, he says, that he served it at his own wedding! Its also low in fat and cholesterol-free. Recipe courtesy of The Engine 2 Diet, by Rip Esselstyn. When I made this recipe, I only needed one box of lasagne noodles because the veggie mixture was so plentiful that I couldnt fit in another layer. The flavor is great, and I think you could use rotini noodles and bake it in a casserole dish for an easier preparation. (Leave the sweet potatoes in chunks if you do that.) Notice that the recipe doesnt call for any oil. If you use a non-stick wok, just add a little water to the bottom and it works just fine.