In a medium bowl, combine the onion, parsley, lemon juice and dried mustard.
Stir in the lamb, mixing well; set aside.
Heat 2 tablespoons of the broth in a nonstick skillet over medium heat.
Add garlic and peppers, sauteing for about 2-3 minutes over medium heat.
Remove them from the skillet and set aside.
Heat the remaining broth in the skillet, adding the lamb mixture; heat until cooked through.
Mix the garlic and peppers with the lamb mixture; continue cooking until all ingredients are heated through.