Roasted Onions with Sage Butter

6 small to medium onions

8 tablespoons (1 stick) unsalted butter, softened

2–3 tablespoons finely chopped fresh sage

1 teaspoon finely grated lemon zest

¼ teaspoon freshly ground black pepper

¼ teaspoon salt

 

Preheat the oven to 375°F (190°C). Peel off the loose outer layer of each onion’s skin, leaving the majority. Slice the onions in half lengthwise and place them faceup on a baking sheet or in a roasting pan. Roast uncovered for 30 minutes, then cover and roast for another 30 minutes. While the onions are cooking, combine the butter with the sage, lemon zest, pepper, and salt, and mix until well combined. When done, the onions will be soft and cooked through, but still juicy. I like them to be just slightly browned on top. If they are not browned, you can finish them off under the broiler for 2 to 3 minutes. Remove from the oven and put 1 to 2 teaspoons of the compound butter on each onion. It will melt into the layers and disappear. Serve the remaining butter at the table. (Any leftover butter will keep in the refrigerator for 5 to 7 days.) Serve the onions in their skins. While it is easy to separate the skins and set them aside, they also tend to soften as they cook, so I eat them skin and all.