A $20 delivered burrito is real, and the burrito was never the expensive part. Start with a $10 menu price. Restaurants pad their delivery app menus around 20% to offset commissions that run 15 to 30% per order, so the same burrito lists at $12. Then the service fee, the delivery fee, and the tip stack on top. The order clears $20 before it leaves the kitchen. Now check who's getting rich off that. The restaurant nets less on the order than on a walk-in. And DoorDash, the company collecting…