Ordered two medium rare cheeseburgers with fries at a local restaurant. We were served in less than 10 minutes. The cheese was melted, the burger had those fat grill marks and a smoky taste, but one was medium, the other medium rare. Everything came so fast I just have the feeling they were pre-cooked because it was missing that "fresh" flavor. What are the signs of a precooked burger since I can't find my way into their kitchen.