Bring a small pot of water to a boil, carefully lower the egg in, and simmer for 7 minutes for a jammy yolk; then transfer to an ice bath.
In a small skillet over medium heat, sauté the diced bell pepper and minced garlic with a splash of water until softened.
Stir in the cooked brown rice, rinsed black beans, cumin, and a pinch of the sea salt; heat through until fragrant and set aside.
Pat the cod fillet dry with a paper towel and season both sides with the remaining sea salt and black pepper.
Heat the olive oil in a non-stick skillet over medium-high heat and sear the cod for 3-4 minutes per side until golden and flaky.
Peel the egg and slice it in half vertically.
Plate the rice and bean mixture, top with the pan-seared cod and egg halves, then finish with a squeeze of lime juice and fresh cilantro.