How many servings does this recipe make?

This recipe makes 4 servings. You can adjust the portion size directly on this page.

What ingredients do I need for Rich Onion Gratin?

You need 12 ingredients. The key ingredients include: 2 large onions, cut into 8 wedges, 3-1/2 cups frozen pearl onions, 3 cups sliced leeks (white portion only), 2 garlic cloves, minced, and more.

Is Rich Onion Gratin suitable as general?

Yes, Rich Onion Gratin falls under the General category and is a great choice for this type of meal.

How do I store leftover Rich Onion Gratin?

Store leftovers in an airtight container in the refrigerator for up to 3–4 days. Reheat gently before serving.

Rich Onion Gratin Recipe

Name: Rich Onion Gratin
Prep time: 15 min
Cook time: 30 min
Total time: 45 min
Yield: 4 servings
Ingredients: 2 large onions, cut into 8 wedges; 3-1/2 cups frozen pearl onions; 3 cups sliced leeks (white portion only); 2 garlic cloves, minced; 1/4 cup butter, melted; 1-1/2 cups heavy whipping cream; 1 tablespoon all-purpose flour; 1/4 teaspoon salt; 1/4 teaspoon pepper; 1/2 cup dry bread crumbs; 2 tablespoons minced fresh parsley; 1 teaspoon paprika

Try this homemade Rich Onion Gratin recipe the whole family will love. Made with onions, frozen pearl onions, leeks and garlic. Easy step-by-step instru…

This Rich Onion Gratin relies on simple, everyday ingredients such as frozen pearl onions, garlic cloves, minced, butter, melted and heavy whipping cream. It comes together quickly and makes 4 servings, at about 332 kcal each. The step-by-step instructions below are written to be easy to follow, even on a busy day.

It's versatile enough for an easy weeknight dinner yet satisfying enough for guests at the weekend. Serve it with your favorite sides, and keep any leftovers for a quick meal the next day.

Updated Jun 30, 2026

Serves 4 General

Tips for the best results

Read through all the steps once before you start and measure out your ingredients first — it makes everything go more smoothly.
Taste as you go and adjust the seasoning before serving.
Avoid overcrowding the pan — cook in batches if needed for the best texture.
Let the dish rest for a few minutes before serving so the flavors settle.
Store leftovers in an airtight container in the fridge and enjoy within a few days.

Variations & substitutions

Use a neutral oil or a plant-based spread in place of butter for a dairy-free version.
A good 1:1 gluten-free flour blend works well if you need a gluten-free version.
Coconut cream is a reliable plant-based alternative to dairy cream.

No specific allergen information. Please check the ingredient list for possible allergens.

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Rich Onion Gratin

Tips for the best results

Variations & substitutions

My Personal Notes

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