French Onion Soup Casserole Recipe | LaaLoosh (2024)

FAQs

How to deepen the flavor of French onion soup? ›

A few sprigs of thyme and a bay leaf elevate the soup even more, but I take it a step further, adding a splash of fish sauce for complexity and depth—don't worry, it won't taste fishy—and a hit of cider vinegar to balance some of that oniony sweetness.

And if you're using onions in your casserole, you can sauté them for a few minutes to deepen their flavor and avoid any raw onion taste in your finished dish.

Baking soda speeds up browning (that Maillard reaction you may have heard about) and leads to softer onions by breaking down the cells faster.

It's up to you! Red and white wine are both worthy flavoring agents for French onion soup and a matter of personal preference. Perhaps the question you should ask yourself is which flavors you want to emphasize.

Fix a bland onion soup by using supermarket broth and mild white onions, tasteless oil for sauteeing, stale plain white bread instead of croutons, and mild white cheese. Start by reducing the broth. Simmering out some water will intensify the flavor of the broth. Once you get it to the right point, add some salt.

You can add extra broth, water, milk, cream (depending on the soup's base) to “water-down” the thyme flavor. Adding a neutral grain, such as rice or beans will help absorb it too.

The underlying flavor of this soup is the deep umami flavor of the caramelized onions. If you rush this process, the result will be a bitter charred flavor, and if you underestimate and skip this process the flavor will be nowhere near as deep or complex.

It just takes a bit of time to caramelize the large quantity of onions. Time is the secret ingredient to making this soup. It takes about 40 minutes (and sometimes a bit longer), for the sugars in the onions to properly caramelize.

The easiest way to thicken your French onion soup is with flour. You can also use cornstarch if you don't have any flour. Remember to never add the flour or cornstarch directly to the soup – otherwise you run the risk of it clumping.

Broth: You can use chicken broth or beef broth to make French onion soup. We've tried all combinations (including using half chicken and half beef broth) and have loved them all.

What is the best sherry for French onion soup? ›

One of the key flavors present in a good bowl of French Onion Soup is thanks to dry Fino or Manzanilla Sherry and/or a dollop of Sherry vinegar. Why not spend a couple of hours slowly cooking down a pile of onions, simmering them in stock, finally topping with cheese?

Begin caramelizing the onions with olive oil and butter: In a 5 to 6 quart thick-bottomed pot, heat 3 tablespoons of olive oil on medium heat. Add the onions and toss to coat with the olive oil. Cook the onions, stirring often, until they have softened, about 15 to 20 minutes.

Perk up a Bland Soup With Simple Pantry Staples

Add a splash of vinegar (any kind!), or a squeeze of citrus. Chances are, you could use a little more salt. Go ahead—it's ok. Salt perks up flat flavors and helps balance out bitter-tasting ingredients.

If the soup is too sweet, add some vinegar. If you would like a little more depth, add a splash of red wine. I like the onion-to-liquid ratio with 6 cups of water. But if you'd prefer a slightly more delicate soup, add an additional 1 cup/240 milliliters water or to taste.

Soak in Vinegar: It only takes about 15 minutes. Soaking raw onions in acid rinses away the harsh flavors and adds pleasant tartness. Soak in Water: Even water washes away those pesky sulfuric flavors. A quick 15-minute soak does the trick.