2/3 cup dry white wine
1/4 cup olive oil
2 1/2 tablespoons cracked pepper
4 teaspoons sugar
2 garlic cloves, pressed
2 red bell peppers, cut into thin strips
2 yellow bell peppers, cut into thin strips
2 1 1/2 pound flank steaks, trimmed
Combine first 7 ingredients in a shallow dish or large heavy duty zip top bag; add steaks. Seal and Chill 8 hours, turning occasionally. Remove steaks and bell pepper from marinade, discarding marinade.
Place bell pepper strips in a grill basket.
Grill steaks and bell peppers, covered with grill lid, over high heat 8 minutes on each side or to desired degree of doneness. Cut steak diagonally across the grain into thin strips.