The flowchart starts with a hamburger order. Fries and a drink are optional (decision symbol). When the customer makes their decision, the system processes them to checkout.

Fast Food Restaurant diagram code in Gleek
start:queue
order hamburger
want fries?:diamond
order fries
want drink?:diamond
order drink
submit order
end:queue
start–>order hamburger–>want fries?-no->want drink?-no->submit order–>end
want fries?-yes->order fries–>want drink?
want drink?-yes->order drink–>submit order
About Flowcharts
A flowchart, or flow chart, is a type of diagram that shows a step-by-step view of a process. Flowcharts document the tasks and decisions needed to achieve a specific goal. A basic flowchart is easy to make and understand. Businesses, engineers and software designers often use flowcharts to diagram their ideas.
Similar flowchart examples
Order process linear flowchart