Ingredients

3/4 cup toasted walnuts, cooled

1/3 cup plain dried breadcrumbs

3 garlic cloves, coarsely chopped

2 teaspoons ground cumin

2 teaspoons ground coriander

1/4 to 1/2 teaspoon red-pepper flakes

Coarse salt and ground pepper

3/4 cup lentils, cooked (below), drained, and cooled

4 tablespoons olive oil

1 large egg

Yogurt-Cilantro Sauce

3/4 cup toasted walnuts, cooled

1/3 cup plain dried breadcrumbs

3 garlic cloves, coarsely chopped

2 teaspoons ground cumin

2 teaspoons ground coriander

1/4 to 1/2 teaspoon red-pepper flakes

Coarse salt and ground pepper

3/4 cup lentils, cooked (below), drained, and cooled

4 tablespoons olive oil

1 large egg

Yogurt-Cilantro Sauce (opposite), for serving (optional)

Preparation

In a food processor, combine walnuts, breadcrumbs, garlic, cumin, coriander, pepper flakes, 1 1/2 teaspoons salt, and 1/4 teaspoon pepper; process until finely ground. Add lentils and 1 tablespoon oil; pulse until coarsely chopped (some lentils should remain whole).

In a large bowl, whisk egg. Add lentil mixture; mix well. Divide into 4 equal-size parts; roll into balls, and flatten with the palm of your hand into 3/4-inch-thick patties.

Heat remaining 3 tablespoons oil in a large nonstick skillet. Add burgers; cook over medium-low heat until crisp and browned, turning gently with a thin-edged spatula, 8 to 10 minutes per side. Transfer to a paper-towel-lined plate to drain. Serve with Yogurt-Cilantro Sauce, if desired.