What is on the brown food?
The onion is on the bread.
   src        edge_attr  dst
0    0             with    4
1    0            above    3
2    1   to the left of    6
3    3            under    0
4    4   to the left of    5
5    4               on    0
6    5  to the right of    4
7    6  to the right of    1