Slice the bell pepper, carrots, and green pepper into strips. Slice the potato into halves and then into 1 inch pieces. Cut each clove of garlic in half.
Heat a large pan on medium heat and coat the bottom with about ⅓ cup of olive oil.
Add all of the veggies to the pan and sauté on medium heat for 2-3 minutes.
Season with paprika, salt, cumin, turmeric, and tomato paste; stir and cook for another 2-3 minutes.
Lower the flame to medium/low, add half of the cilantro and about ¾ cups of water, stir together, cover, and cook for about 12-15 minutes until veggies are tender.
Lightly salt the fish fillets and place them into the pan, ensuring they are coated in sauce. If needed, add another ¼ cup of water.
Top with remaining cilantro, cover the pan, and cook on low flame for about 20-25 minutes, spooning sauce over the fish halfway through.
Add lemon slices from half a lemon at the end and squeeze remaining lemon juice over the top before serving.