Pasta with Fennel, Kale and Lemon
2-3 tablespoons extra virgin olive oil1/2 large red onion, thinly sliced2 fennel bulbs, (tough outer layer removed and fronds reserved) thinly sliced3 large garlic cloves, finely slivered2-3 large pinches red pepper flakes1 large bunch of lacinato kale, tough stems removed...