Dosas—wonderfully thin lentil-flour crepes enfolding fillings such as spiced potatoes—are getting a higher profile. You’ll even find them among the lunch options at the Foggy Bottom Whole Foods. To sample the best, settle into these vegetarian cafes. The uttapams, which are thicker pancakes, are pretty great, too. And the weekend lunch buffet is a riot of vivid flavors and colors.