Chickpea Flatbreads with Burst Tomato Sauce
1 teaspoon sherry or red wine vinegar
1/4 teaspoon merquén or smoked paprika (optional)
2 tablespoons cold unsalted butter, cut into pieces
1 cup coarsely grated queso fresco or crumbled
feta (about 5 oz.)
Baby greens, such as arugula,
kale, or spinach, and lemon
wedges, for serving