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baked onion with olive oil

Baked or seared onion appetizer

Containing nutritious quercetin, onion can be used as spice or main ingredient. This tasty baked or seared onion appetizer is made with olive oil or butter.
Course Appetizer
Cuisine French, Italian, Japanese
Keyword baked onion, onion dish, quercetin
Prep Time 5 minutes
Cook Time 30 minutes
Total Time 35 minutes
Servings 2 people
Calories 83kcal


  • 1 red onion (use yellow or red onions, higher in quercetin than white ones)
  • 1 tbsp olive oil (or butter if searing in a pan)


Method 1: baking the onion

  • Preheat oven to 350 F degrees. 
  • Cut the onion in two, and also slightly trim the bottom edges for the half cuts to stand horizontal. Keep the skin on to retain moisture during the baking process.
  • Also cut the inside of the onion in 6-8 slices. Only cut the inner parts while leaving the skin intact for the outside layer to remain whole.
  • Add the oil on the top of each half and spread it evenly to cover the horizontal surface. 
  • Bake for 30 minutes, then serve immediately. 

Method 2: searing the onion

  • Slice the onion in half, then remove the outer skin layer.
  • Place oil or butter in a frying pan and heat on medium level.
  • As soon as the butter is melted, add the onion cuts into the pan. Lower heat to slow cooking
  • Sear on each side for a total of 15 to 20 minutes, then serve immediately.


Calories: 83kcal | Carbohydrates: 5g | Fat: 7g | Sodium: 2mg | Potassium: 80mg | Sugar: 2g | Vitamin C: 4mg | Calcium: 13mg | Iron: 0.1mg