3 red onions; peeled, cut lengthwise
1 cup balsamic vinegar
1/4 cup extra-virgin olive oil
1/3 cup honey
sea salt
black pepper
1/2 stick unsalted butter
1/4 bunch thyme

1. Preheat the oven to 325 degrees F.

2. Put the onions on a sheet pan, cut side up, and drizzle with balsamic vinegar, olive oil, and honey. Season with salt and pepper then top each with a pat of butter and fresh thyme. Bake for 40 minutes, until the onions are soft and caramelised around the edges.