Step 1

Preheat the oven to 450 (225C) degrees and arrange a rack on the lowest shelf.

Step 2

Pat the greens dry with a clean towel.

Step 3

Put the beans on a large rimmed baking sheet. Add the oil, shallot, salt and pepper. Toss together and arrange the beans in an even layer.

Step 4

Roast until the beans are beginning to blister, turn golden brown and the shallots are caramelized. To cook evenly, flip them around with tongs after they've been in the oven about 10 minutes. Depending on your oven it should take 15-20 minutes until they're done.

Step 5

To serve, transfer the beans to a serving bowl or platter and sprinkle the lemon zest over the top.