Aloo Gobi Masala (Cauliflower Potato Curry)

Name: Aloo Gobi Masala (Cauliflower Potato Curry)
Prep time: 10 min
Cook time: 35 min
Total time: 45 min
Cuisine: Indian
Ingredients: 1/4 cup cooking oil (or ghee); 1 tsp cumin seeds; 1 medium onion (finely chopped); 3 garlic cloves (crushed); 1 tsp garam masala; 1 tsp ginger powder; ½ tsp turmeric powder; ½ tsp curry powder; 1/4 tsp chilli powder; 1 1/2 tsp salt; 3 medium tomatoes (finely chopped); 1 small head of cauliflower (cut into small florets with stems); 2 small russet potatoes (peeled and cut into 1/2-inch cubes); 1 small green chili pepper (sliced); 1 tsp lemon (or lime juice (plus more for serving)); 2 tbsp chopped cilantro leaves; 2-3 Naan bread ((optional) for serving)