Lettuce wraps are just a reworked version of a taco, and who doesn't love a good taco? I have one child who will eat anything if there is a good sauce on it and this tomatillo-poblano sauce definitely qualifies as tasty and healthy in my book. Tomatillo is not a "little tomato" as its literal Spanish translation might imply, but it is a relative of the tomato and in the nightshade family. It's tart and when roasted blends well with the mild taste of a poblano. Make extra sauce and spoon it on any mild, flakey white fish or a grilled piece of chicken! Two meals in one.