Mustard Grilled Onions

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Mustard Grilled Onions
1 cup Dijon mustard 1-2 Tbsp. dried tarragon 2 Tbsp. white wine vinegar 3 large red onions, sliced
Mix mustard, tarragon, and vinegar together. Pour over sliced onions and marinate for one hour. Grill onions until desired temperature. Brush with more marinade as needed.