Crispy Pan-Fried Beans and Wilted Greens

(1/2 bunch) Swiss chard

onion, thinly sliced

garlic, minced

or one 15-ounce can) cannelloni or other white beans, drained and rinsed

Zest from one lemon

Juice from 1/2 lemon

za'atar spice blend

to 2 teaspoons salt

Good-quality extra-virgin olive oil