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Caramelised onion red wine sauce served in a gravy boat
Deep, rich red wine reduction with sweet caramelised onions

Rich caramelised onion and red wine sauce

Author: Flavelo
Recipes Sauces and Gravies
This sauce is a lesson in patience. We slowly, gently coax the natural sugars out of the onion to caramelise them, then marry this deep sweetness with the tannic, acidic character of red wine. The result is a thick, glossy, complex sauce that elevates a simple roast meat to restaurant quality. It can't be rushed, but it's worth every minute.
🕒 Prep Time 10 mins
🍳 Cook Time 30 mins
⌛ Total Time 40 mins
🍽️ Servings 4 servings
🔥 Calories 150 kcal
🌍 Cuisine French

Ingredients

Equipment Needed

  • Heavy-bottomed pan (for even heat distribution)
  • Wooden spoon
  • Sharp knife

Allergen Information

⚠️ Milk
⚠️ Sulphites

Instructions

1 ✓

Chopping onions: Cut the onions in half, then slice them into even semi-circles.

Tip: Uniform thickness is key so the slices cook at the same time and you don't end up with burnt or raw pieces.
2 ✓

Caramelising: Melt a little butter (approx. 10g) in a pan, add the onions. Sauté on low heat, stirring often, for about 15-20 minutes until golden brown and soft.

Tip: Don't rush it! The sugars in the onion transform into caramel slowly. If the heat is too high, they will burn before softening.
3 ✓

Adding sugar: Sprinkle with brown sugar and stir to melt and coat the onions.

Tip: The extra sugar helps achieve a deeper colour and glossier texture.
4 ✓

Deglazing: Pour in the red wine. Scrape up any browned bits stuck to the bottom of the pan.

Tip: Those brown bits on the bottom are full of flavour (this is the 'fond'); the acidity of the wine helps dissolve them.
5 ✓

Reduction: Boil the wine for 5 minutes until the alcohol evaporates, then add the stock and balsamic vinegar. Simmer on low heat until the sauce thickens (approx. 10-15 minutes).

Tip: During reduction, water evaporates, concentrating flavours and naturally thickening the sauce.
6 ✓

Mounting: Remove from heat and stir in the remaining cold butter (20g) until melted. Season with salt and pepper.

Tip: Stirring cold butter into a warm sauce (mounting) gives the emulsion a glossy shine and silky texture.

Recipe FAQ

What wine should I use?
One you would drink. Cooking concentrates flavours, so the faults of a bad wine (e.g. cork taint or excessive acidity) will be amplified.
The onions burned, can I save it?
Unfortunately not. The bitter, burnt taste ruins the whole sauce. Start again and use a lower heat.

Ingredients

  • 2 whole Red onions
  • 200 ml Dry red wine
  • 1 tbsp Brown sugar
  • 30 g Cold butter (for mounting at the end)
  • 100 ml Beef stock
  • 1 tbsp Balsamic vinegar
  • 1 pinch Freshly ground black pepper
  • 1 pinch Salt