Sunday Suppers: 30-Minute Sriracha Pepper Steak

For the Marinade:

• 1 clove garlic, minced
• 1/2 tablespoon brown sugar
• 1/3 cup soy sauce
• 1/3 cup water
• 1 tablespoon balsamic vinegar
• 2 teaspoons corn starch
• 1 1/2 tablespoons Sriracha hot sauce

For the Pepper Steak:

• 1 tablespoon unsalted butter
• 1 lb. thinly sliced flank steak, cut diagonally across the grain into thin strips
• 2 1/2 tablespoons sesame oil, divided
• 1 large red bell pepper, deseeded and thinly sliced
• 1 large orange bell pepper, deseeded and thinly sliced
• 1 large yellow bell pepper, deseeded and thinly sliced
• 1 medium red onion, thinly sliced
• 2 tablespoons fresh ginger, grated
• 6 garlic cloves, minced
• 2 handfuls of fresh baby spinach
• *Rice, quinoa, or couscous recommneded for serving