When you want to do a quick doodle sketch from your imagination or memory you can do it by know how to draw certain shapes, like the elipse.
Use the elipse or squashed circle as the first shape when you want to draw a meal. Adjust the elipse sizes and then refine them by sketching in the actual edges of the object over your pencil elipse lines.
Then go over your pencil lines with a waterproof pen.
Erase your pencil lines and paint your meal. Buon Appetito!