Grilled Flank Steak with Horseradish Sauce

This is my favorite marinade for flank steak.

Flank Steak Marinade

1 onion, chopped

3 cloves garlic, chopped

1/2 cup olive oil

1/4 cup white wine vinegar

2 TBSP Worcestershire sauce

2 tsp sugar

1 tsp salt

1 tsp pepper

Combine all ingredients in ziploc bag. Marinate 8 hours, turning occasionally.

Grill, covered with grill lid, over medium-high heat (350° to 400°) 8 to 10 minutes on each side or to desired degree of doneness. Cut steak diagonally across the grain into thin strips. Serve over salad greens with Horseradish Sauce.

Horseradish Sauce

1 8oz sour cream

4 TBSP horseradish

2 TBSP white wine vinegar

1 TBSP mayonnaise

1 TBSP fresh chopped parsley

1/2 tsp salt

1/8 tsp pepper

Source: Southern Living