According to the statistics by the government, the most consumed vegetable is cabbage. Onion is the second. I do not think that white radish (rank 3 vegetable) is common outside Japan. The following table shows yearly consumption of vegetables by purchased volume (unit: gram).
It is the average figure from 2011 to 2013. The survey was conducted by the Japanese government and target people were families which consist of more than two members. So this data does not include single households.
| Vegetable | Purchased Volume (g) |
| Cabbage | 18,012 |
| Onion | 15,907 |
| White Radish (daikon) | 13,473 |
| Tomato | 11,605 |
| Potato | 10,813 |
| Carrot | 8,680 |
| Chinese cabbage (hakusai) | 8,444 |
| Cucumber | 8,394 |
| Sprout | 7,079 |
| Lettuce | 5,935 |
| Leek (negi) | 5,030 |
| Pumpkin | 4,553 |
| Eggplant | 4,481 |
| Broccoli | 3,674 |
| Spinach | 3,441 |
| Sweet potato | 2,899 |
| Green pepper | 2,639 |
| Beans | 2,243 |
| Taro (satoimo) | 2,140 |
| Burdock | 1,970 |
| Shiitake mushrooms | 1,651 |
| Lotus root | 1,394 |
| Bamboo shoot | 988 |
| Others | 26,738 |
White raddish (daikon)

Chinese cabbage (hakusai)

Leek

Taro (satoimo)

Shiitake mushrooms

Lotus root


Source is Statistics Bureau, Ministry of Internal Affairs and Communications.
www.stat.go.jp/data/kakei/zuhyou/rank05.xls
www.stat.go.jp/data/kakei/5.htm
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