French Onion Soup

Name: French Onion Soup
Prep time: 9 min
Cook time: 18 min
Total time: 27 min
Yield: 4 servings
Cuisine: France
Ingredients: 50g Butter; 1 tbs Olive Oil; 1 kg Onion; 1 tsp Sugar; 4 sliced Garlic Clove; 2 tbs Plain Flour; 250ml Dry White Wine; 1L Beef Stock; 4 sliced Bread; 140g Gruyère

By The Spice & Simmer Kitchen · Published May 3, 2026

A one-pot Side recipe with France flavors, built for busy weeknights when you want real food without a sink full of dishes. Comes together in roughly 39 minutes, serves about 4, and uses ingredients you can find at any normal grocery store. The technique is simple: build a base in your pot, layer in the main ingredients, simmer until everything has had time to talk to each other, and serve straight from the pan. If you're cooking for picky eaters, this one tends to land — the flavors are recognizable, the texture is comforting, and there's nothing weird hiding in the ingredient list. Perfect for the kind of evening where you want dinner on the table by 7pm and the kitchen empty by 7:30.

Ingredients

Makes 4 servings · 27 min total

50g Butter
1 tbs Olive Oil
1 kg Onion
1 tsp Sugar
4 sliced Garlic Clove
2 tbs Plain Flour
250ml Dry White Wine
1L Beef Stock
4 sliced Bread
140g Gruyère

Step-by-step instructions

Melt the butter with the oil in a large heavy-based pan. Add the onions and fry with the lid on for 10 mins until soft. Sprinkle in the sugar and cook for 20 mins more, stirring frequently, until caramelised. The onions should be really golden, full of flavour and soft when pinched between your fingers. Take care towards the end to ensure that they don’t burn.
Add the garlic for the final few mins of the onions’ cooking time, then sprinkle in the flour and stir well. Increase the heat and keep stirring as you gradually add the wine, followed by the hot stock. Cover and simmer for 15-20 mins.
To serve, turn on the grill, and toast the bread. Ladle the soup into heatproof bowls. Put a slice or two of toast on top of the bowls of soup, and pile on the cheese. Grill until melted. Alternatively, you can complete the toasts under the grill, then serve them on top.

Why this works on a weeknight

French Onion Soup genuinely fits a 30-minute weeknight window, which is why it earned a spot in our Quick Soups & Stews collection. The technique is forgiving, the ingredient list is grocery-store standard, and the active cooking time is short enough that you can answer a text message in the middle without ruining dinner.

Cleanup notes

This is a single-pan recipe, so the cleanup is exactly one pan, one cutting board, and one knife. While the dish rests, fill the pan with hot soapy water — by the time you are done eating, the residue lifts off with a single pass of a sponge. Skip the steel wool on cast iron; a stiff brush and warm water are all you need to keep the seasoning intact.

Make-ahead and leftovers

Leftovers keep covered in the fridge for up to three days. Reheat in a dry pan over medium-low with a splash of water or stock to loosen the sauce. French Onion Soup actually improves overnight as the flavors keep talking to each other, so doubling the recipe and packing tomorrow's lunch is a high-leverage weeknight move.

Filed under 🥣 Quick Soups & Stews Side France ⚡ 30-Min Dinner Soup