1 1/4 cups French green lentils, rinsed, drained (these are available at specialty foods stores and some supermarkets)
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)
1. Place lentils in a saucepan and add water to cover by 3". Bring to a boil. Reduce heat to a simmer and cook, adding more water if needed to keep lentils covered, until lentils are tender, about 20 minutes. Drain; spread out lentils on a baking sheet and let cool.
2. Meanwhile, whisk lime juice, oil, garlic, cumin, and sugar in a small bowl to combine. Season dressing to taste with salt and pepper.
3. Combine cooled lentils, rice, tomato, chopped cilantro, and onion in a large bowl. Pour dressing over and gently mix to coat well; season to taste with more salt and pepper. Top with avocado, if using. Garnish with cilantro sprigs and lime wedges for squeezing over.