Place the turkey, onion, bell pepper and garlic in a nonstick frying pan over medium heat. Season with the chili powder and salt. Brown the meat, breaking it up as it cooks, for about 10 minutes.
Stir in the tomato sauce and jalapeños, and continue to cook for another 10 minutes.
Remove from the heat and serve, open-faced, on toasted Italian bread or seeded rolls, topped with the relish.