Set out a mixing bowl that will fit in your refrigerator
Cut the lamb into one-inch cubes
Pour the sauces and wine over the lamb
Cut the onions and peppers into large slices or squares
Add them (and the mushrooms if you are using them) to the marinade and mix
Cover and leave overnight in the refrigerator
Drain the marinade.
Place the marinated meat and vegetables on the skewers, so there’s an order. For example, meat-white onion-green pepper-mushroom-meat (and so forth).
Grill looking for a light char and an internal temperature of 120F for medium rare. Remember, the meat will continue cooking internally somewhat once off the grill.
Serve with rice pilaf, naan, or a fresh cucumber salad