Grilled Steaks with Red Pepper Sauce

• 4 red bell peppers quartered, stem and seeds removed
• 2 yellow onions sliced in rounds (¼ in.)
• 2 garlic cloves
• olive oil to drizzle and rub
• 32 oz flank steaks
• ½ tsp salt
• ¼ tsp ground black pepper

Red Pepper Sauce

• 4 oz olive oil
• ½ tsp salt to taste
• ¼ tsp ground black pepper