Pureed roasted onions pep up steaks and sandwiches.
Preheat oven to 400 degrees. Cut onions into wedges, leaving root ends intact, and peel. Toss in olive oil in a baking pan. Roast until caramelized, about 50 minutes, turning occasionally. Puree in a food processor.
Can be stored up to 1 week in the refrigerator.