What kind of vegetable is on the dish?
The vegetable is lettuce.
    src        edge_attr  dst
0     1               on    0
1     1   to the left of    2
2     2               on    0
3     2  to the right of    1
4     2  to the right of    3
5     3   to the left of    9
6     3   to the left of   18
7     3   to the left of   17
8     3   to the left of   11
9     3   to the left of   13
10    3   to the left of   20
11    3   to the left of    8
12    3   to the left of    2
13    4   to the left of    7
14    5   to the left of    8
15    6   to the left of    8
16    6               on    7
17    7  to the right of    4
18    8               on    0
19    8  to the right of    6
20    8  to the right of    5
21    8  to the right of    3
22    9  to the right of    3
23    9  to the right of   14
24    9  to the right of   18
25    9  to the right of   16
26   10  to the right of   12
27   10   to the left of   20
28   10        on top of   18
29   11        on top of   18
30   11  to the right of   14
31   11  to the right of   12
32   11  to the right of    3
33   12        served on    0
34   12   to the left of   10
35   12   to the left of   11
36   12   to the left of   14
37   13               on    0
38   13  to the right of    3
39   14   to the left of   11
40   14  to the right of   12
41   14   to the left of    9
42   14   to the left of   20
43   15   to the left of   18
44   15   to the left of   16
45   16  to the right of   15
46   16   to the left of    9
47   16   to the left of   18
48   17  to the right of    3
49   17               on    0
50   18  to the right of   15
51   18  to the right of    3
52   18   to the left of    9
53   18             with   11
54   18             with   10
55   18  to the right of   16
56   20  to the right of    3
57   20  to the right of   10
58   20  to the right of   14