Lentil Burger Lettuce Wraps

Ingredients

• 2 cups finely chopped onions
• 1 cup coarsely chopped carrots
• 1 cup coarsely chopped celery
• ½ of a 15-oz. can diced tomatoes, drained (¾ cup)
• 1½ cup packed fresh parsley
• 2½ teaspoons garlic powder
• 2 tablespoons mild chili powder
• 3 cups cooked lentils
• 1 cup cooked brown rice
• 1 tablespoon white wine vinegar
• Sea salt, to taste
• Freshly ground black pepper, to taste
• 12 to 18 large romaine lettuce leaves
• 3 cups cooked chickpeas
• 3 tablespoons lemon juice