- 1/3 c. balsamic vinegar
- 1/3 c. Worcestershire sauce
- 1/3 c. olive oil
- 2 garlic cloves, grated
- 1/2 tsp. ground black pepper
- 1/4 tsp. red pepper flakes (optional)
- 2 tbsp. honey, divided
- 2 tbsp. Dijon mustard, divided
| - 1 1/2 lb. sirloin or New York strip, cut into 1-inch cubes
- 8 oz. baby portobello mushrooms, large stems removed
- 1 red onion, cut into 1-inch pieces
- 1 green bell pepper, cut into 1-inch pieces
- 1 yellow bell pepper, cut into 1-inch pieces
- 1 red bell pepper, cut into 1-inch pieces
- Chopped fresh parsley, for garnish
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