Spicy Stewed Sausages with Three Peppers

sweet Italian sausage, pricked all over with a fork

extra-virgin olive oil, plus more for brushing

red bell peppers, cut into 1-inch dice

green bell peppers, cut into 1-inch dice

yellow bell peppers, cut into 1-inch dice

medium red onion, thinly sliced

small fennel bulb—trimmed, cored and thinly sliced

serrano chiles, seeded and thinly sliced crosswise

habanero chile, seeded and thinly sliced

Salt

dry red wine

freshly grated pecorino cheese (3 ounces)

Crusty bread, for serving