Purple Sweet Potato Nicoise

While the sweet potatoes roast, bring a medium pot of water to a boil with a pinch of salt.

Meanwhile, mince the olives and half the shallot. Make the black olive vinaigrette: in a small bowl, mix together the minced olives, minced shallot, 2 tablespoons sherry vinegar, 2 tablespoons olive oil, and a large pinch of salt and pepper.

Trim and cut the green beans into 2-inch pieces, then place in the boiling water for 2-3 minutes, until crisp-tender. Drain and rinse under cold water.

Halve the grape tomatoes. Pick the parsley leaves. Drain and rinse the chickpeas. Peel and dice the cucumber.