I tried this and liked it alot!
 

• 1 large orange
• 1 lemon
• 1/4 cup pineapple juice
• 1/4 cup white wine
• 1/4 cup soy sauce
• 1 clove minced garlic
• 1 tblspoon crushed black pepper
• 1 or 2 dried chilis, left whole
• 3 or 4 tblspoons melted butter
• A couple pounds of flank steak

Grate 1 tblspoon peel from the orange, and 2 tspoons peel from the lemon.
Squeeze orange and lemon to get 1/4 cup juice each. Place all ingredients except meat in a shallow dish and mix thoroughly. Place meat in marinade, cover with plastic wrap, and let marinade at room temp for no more than 2 hours.

Place 2 racks in the oven...and on the bottom rack, place your fajita sizzlers (the cast iron pans they are served in)
Turn oven to BROIL
Place flank steak in a roasting pan on top rack and broil 5-6 minutes each side.
While meat is cooking, sautee onions and green peppers in a frying pan with butter or olive oil until onions are clear...feel free to baste with the marinade from the steak.
Slice meat in thin slices, and serve with vegetables lime slices, and tortillas on hot fajita sizzlers.