Americans spend more than $600 billion a year eating out. Busy consumers don't have the time or inclination to cook — they want tasty, nutritious meals without dishes to wash. More and more singles, working parents and seniors are demanding greater convenience and are turning to restaurants to fill that need. There's plenty of room for more food businesses, but for a successful startup you need more than just good recipes. You also need to know about planning, capitalization, inventory control, and payroll management.