This Secret Ingredient Perfected My French Onion Soup Recipe (8 Years in the Making)

Eight years ago, I put French Onion Soup on the menu at Maison + Café François. It hasn't come off since. This is the version we perfected — and the secret ingredient that made it what it is. It started on a ski trip to the Alps as a kid. Burned my tongue then. Burn it nearly every time I make it now. Some things don't change. What makes this different from every other French Onion Soup recipe: The onions need 45 minutes, low and slow — no shortcuts. Time is the real ingredient. Forget standard stock. We use a proper beef tea — this is the gap between what you get at home and what you get in a restaurant. The secret ingredient: soy sauce. Adds depth, rounds out the caramelised onion flavour, and makes every other element sing. It sounds wrong. It's not. Onion size matters — cut to the size of a soup spoon. No long stringy bits. This is how we do it in a professional kitchen. Ingredients 10 liters Water 3.5 kilograms Beef shin 1 Pigs trotters 1 Ox tongue 3.5 kilograms Chicken wings 200 grams Shallots, peeled and halved 15 grams Garlic cloves 12 grams Thyme 16 grams Tarragon 560 milliliters Soy sauce 600 milliliters Madeira wine - 1.5 kilograms Onions (about 6), finely sliced 100 grams Butter 3 Garlic cloves, crushed 3 Bay leaves - 0.5 Baguette, 1 day old 250 grams Gruyère cheese 10 grams Chopped chives I'm Matthew Ryle — Executive Chef at Maison + Café François, London, and author of French Classics. This channel is where restaurant technique meets your home kitchen. My cookbook, French Classics, is available now — link in bio. 0:00 Introduction 0:14 The Secret Stock (Beef Tea Recipe) 1:31 Stock Ingredients Breakdown 2:56 The Shortcut Option (No-Fuss Version) 3:15 How to Slice Onions Properly 5:36 Sweating the Onions 6:55 Caramelising the Onions 8:19 Combining Stock & Onions 10:01 Assembling: Bread & Gruyère 11:15 Under the Grill 11:48 The Taste Test