Step one:
First draw a semicircle and connect it with arcs.
Step 2:
Then use large wavy lines to draw the shape of the vegetable leaves below.
Step 3:
The patties under the leaves are drawn with small wavy lines.
Step 4:
Then draw another semicircle and connect them to form the bread below.
Step 5:
On top of the bread, add some small dots as sesame seeds.
Step 6:
Finally, apply a nice color and the burger is ready.