What is the vegetable on top of the food next to the sandwich?
The vegetable is an onion.
    src       edge_attr  dst
0     0      underneath    3
1     0      underneath    4
2     0      underneath    1
3     0            near   17
4     1            near    4
..  ...             ...  ...
56   17         wearing   10
57   17         next to    0
58   19  to the left of   12
59   19       on top of    1
60   19  to the left of    2

[61 rows x 3 columns]