Vegetable Lentil Curry

Name: Vegetable Lentil Curry
Prep time: 15 min
Cook time: 20 min
Total time: 35 min
Cuisine: Indian
Ingredients: 2 cups cooked brown lentils; 2 tbsp oil; 1 small onion (chopped); 1 tbsp ginger garlic paste; 1 cup canned tomatoes; 2 tbsp curry powder; ½ tsp chili powder (optional); Salt and pepper (to taste); 1 small carrot (peeled and diced); 1 small bell pepper (any color, diced); 1 cup cauliflower florets; 1 small sweet potato (peeled and diced); ½ cup peas (fresh or frozen); 1 cup baby spinach; 1 can coconut milk; ½ lemon