Rinse the rice and cook it in 400 ml (1 2/3 cups) of water: bring to a boil over high heat, cover, simmer on low for 15 minutes and rest 5 minutes. Stir in half the lime juice and cilantro.
Slice the peppers and onion. Toss the shrimp with the chili powder, cumin, smoked paprika and salt.
Heat half the oil in a large skillet over high heat. Cook the peppers and onion for about 6 minutes, stirring now and then, until charred and tender-crisp. Tip into a bowl.
Add the rest of the oil and sear the shrimp in one layer for about 2 minutes per side, until pink and opaque all the way through.
Warm the black beans for 1 minute in the microwave.
Build the bowls with rice, beans, peppers, shrimp and salsa, and finish with the rest of the lime and cilantro.