Cook the shrimp: heat the oil in a large skillet over medium-high heat and saute the onion, garlic, and bell pepper until crisp-tender, about 3 minutes. Add the cumin, paprika, and coriander, and cook for 30 seconds more. Mix in the shrimp and cook them for 2 minutes on each side, or until they turn pink and opaque. Add the lime juice, and season with salt and pepper. Set aside.