In the same pan, brown the chicken and onions in the sage-flavoured oil. Add the garlic and pepper and cook for 1 minute. Add the chorizo, tomatoes, pepper flakes, and white wine. Top with the chicken pieces, skin side up. Bake for about 45 minutes, uncovered. Add the peaches and bake uncovered for 15 minutes. Season with salt and pepper. Top with fried sage leaves. Serve with white rice.