Roasted Asparagus With Feta with butter

4 slices bacon , cut into 1/4-inch wide strips 1 large red onion , halved and sliced thin 2 tablespoons balsamic vinegar 1 tablespoon maple syrup 1 tablespoon[...]

2 lbs asparagus 1 tablespoon fresh sage , finely chopped 1 1/2 tablespoons olive oil salt 1 cup olive oil , for frying 30 medium sage leaves , patted dry[...]