Lentil and Rice Salad

Name: Lentil and Rice Salad
Ingredients: 1 1/4 cups French green lentils, rinsed, drained; 1 /3 cup fresh lime juice; 2 tablespoons extra-virgin olive oil; 4 teaspoons minced garlic; 1 teaspoon ground cumin; 3 /4 teaspoon sugar; Kosher salt and freshly ground black pepper; 2 cups steamed brown rice or brown basmati rice, cooled; 1 tomato, halved, seeded, chopped; 1 /3 cup coarsely chopped fresh cilantro plus sprigs for garnish; 1 /3 cup thinly sliced red onion (from about 1/4 onion); Avocado wedges (optional); Lime wedges