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Export 3 ingredients for grocery delivery
Step 1
Adjust oven rack to lowest position; heat to 425 degrees.
Step 2
Cut onions in half; toss with oil and a generous sprinkle of salt and pepper. Place, cut-side down, on a lipped cookie sheet.
Step 3
Roast until tender and cut surfaces are golden brown, 25 to 30 minutes. Adjust seasonings; drizzle with balsamic vinegar.