What vegetables are in the salad?
The vegetables are onions.
    src        edge_attr  dst
0     0   to the left of    9
1     1               in    2
2     1   to the left of    9
3     1   to the left of    3
4     2   to the left of    9
5     2   to the left of    7
6     2   to the left of    5
7     3   to the left of    5
8     3  to the right of    1
9     3   to the left of    7
10    5  to the right of    2
11    5  to the right of    3
12    7  to the right of    3
13    7  to the right of    2
14    9  to the right of    0
15    9  to the right of    1
16    9  to the right of    2