Ingredients

1 1/2 cups (1 3/4 ounces) loosely packed sorrel leaves, stems trimmed 

1/2 cup freshly grated Parmesan cheese (from a 1-ounce piece) 

1/4 cup pine nuts 

1 teaspoon fresh lemon juice 

Coarse salt 

1/2 cup extra-virgin olive oil, plus more for drizzling 

8 Flatbreads 

4 cups assorted edible weeds, such as chickweed, purslane, or lamb's-quarters 

Preparation

Process sorrel, Parmesan, pine nuts, lemon juice, and 1/2 teaspoon salt in a food processor until coarsely ground. With machine running, add oil in a slow, steady stream until mixture is emulsified. (Pesto may be refrigerated in an airtight container for up to 3 days.)

Spread 2 tablespoons pesto on each flatbread, and top with 1/2 cup edible weeds. Drizzle with oil, and sprinkle with salt. Serve immediately.