Your monthly cell phone bill might be less than a box of iceberg lettuce.

A British man was charging £50 (roughly $60) for a box of 12 heads of the crunchy salad green earlier this month, the BBC reports. Others are charging double and sometimes even more, the normal asking price. “A black market for [iceberg] has emerged,” says Maria Bertoch, a foodservice industry expert at The NPD Group.

That’s because there’s a shortage of iceberg lettuce in Britain. Some stores are completely out of it and others have limited the number of lettuces consumers can buy. (U.S. consumers, who consume more iceberg than any other kind of lettuce have been spared this; they pay about $1 per pound.)
That’s sending iceberg-loving Brits into a frenzy. On Twitter, #iceberglettuce is getting a lot of love, with people lamenting over their iceberg-less plates and other iceberg travesties.

Though the shortage issue isn’t just limited to iceberg — some stores were almost entirely out of all lettuce and some other vegetables like zucchini are in short supply — that’s what sent consumers into a frenzy.

That has us asking: Why?

After all, iceberg, in some ways, is inferior to other lettuces. Food snobs usually pooh-pooh the crunchy green leaves. The New York Times once noted that iceberg has been “described as a plant to avoid as though you were the Titanic with a second chance.” And in many ways, it’s not quite as good for you as its greener cousins anyway.

The CDC ranked nearly 50 fruits and vegetables using a “nutrient density score,” with higher scores representing more nutritionally dense foods. It looked at 17 important nutrients including potassium, fiber, protein, calcium, iron, thiamin, riboflavin, niacin, folate, zinc, and vitamins A, B6, B12, C, D, E, and K; scores ranged from 10.47 to 122.68. Here’s how your lettuce varieties stack up, with higher scores indicating higher nutrition density.

This story was originally published on MarketWatch.