I know a lot of people already know about this, but it never occurred to me, so I thought I would post. The other night we had tacos. I made all the ingredients as I normally do (ground beef, shredded cheese, chopped onions, chopped tomatoes, salsa, sour cream, guac), but then instead of taco shells, we used romaine leaves. The spine of the romaine lettuce totally supports the taco, and they were really good. I can't believe it took me so long to try it. You could do other taco-like things as well like chicken or beef fajitas with toppings or peanut satay.