Mercimek Köftesi with Piyaz Salad

Ingredients

• 1 cup red lentils (rinsed)
• 2 cups water
• 3/4 cup fine bulgur
• 1/4 cup olive oil
• 1 yellow onion (medium, finely diced)
• 2 tablespoons tomato paste
• 1 1/2 teaspoons paprika (ground)
• 1 teaspoon cumin (ground)
• 1/2 teaspoon red pepper flakes
• 3/4 cup fresh parsley (chopped, divided)
• 1/2 cup fresh mint (chopped, divided)
• 3 tablespoons fresh lemon juice (divided)
• 1 3/4 teaspoons salt (divided)
• 1/2 teaspoon black pepper (ground, divided)
• 15 ounces cannellini beans (rinsed and drained)
• 1/2 red onion (small, thinly sliced)
• 1 Roma tomato (ripe, diced)
• 1 teaspoon sumac
• 6 lettuce leaves (large)