Sheet Pan Flank Steak with Onions and Asparagus

Ingredients

• 1 1/2 pound flank steak
• 2/3 C olive oil
• 1/4 C red wine vinegar
• 1/3 C coconut aminos
• 1 tsp salt
• 2 tsp dried oregano
• 2 tsp onion powder
• 2 cloves crushed garlic
• 1 onion
• 8 ounces asparagus spears
• salt