Slow Cooker French Onion Soup Recipe (2024)

FAQs

How do you deepen the flavor of French onion soup? ›

Tomato paste is added for a touch of sweetness that truly deepens the broth. It does sound unusual for this soup, but believe me, do not skip it. Garlic purée adds another layer of garlic's sweet flavor without the acrid overwhelm fresh garlic can infuse.

It can be nice to cook the onions beforehand, as the flavour is different to when you put them in raw, but experiment both ways as you may find you prefer one. It can also be good to brown meat to give it some colour, but again, this is not essential.

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

You'll be rewarded with richer, more intense flavors in your soup. There is very little evaporation in the slow cooker. If you're adapting a regular soup recipe, it's likely that you won't need to use all the liquid called for. Put all your ingredients in the slow cooker and then pour the broth over top.

To amp up the flavor further, I add a generous amount of white wine, along with aromatic thyme and garlic. Then, I finish it all off with a classic French onion soup essential: toasty baguette topped with melty cheese!

Butter, sprinkle of sugar and teaspoon of Worcester sauce. Melt butter in pan, add onions, sugar and Worcester Sauce, gently fry until onions have browned slightly and sweetened. Add your sherry or wine and reduce for 10 minutes. Add beef stock and let the soup summer for half hour.

The difference between "High" and "Low" on slow cookers seems to differ with every brand and model. One thing that is consistent, though, is that food takes seven to eight hours to reach a simmer point (around 210°) on low; versus three to four hours on high.

If you cook red onion with alkaline foods, such as nuts, lentils, and some vegetables, those anthocyanins revert to their blue hue. The same is true of red cabbage. To maintain the red hue, add a little acid, such as a splash of vinegar or a squeeze of lemon juice.

Tender vegetables

Vegetables such as peas, asparagus and peppers can become a flavorless, mushy mess in a slow cooker.

In this case, however, the lemon provides more of a flavor undertone that enhances other seasonings like thyme, parsley, and turmeric. According to trained chef Leetal Arazi, who spoke with Real Simple, you can bring a "zesty flavor" to your soup simply by adding lemon.

What is the best wine to use in French onion soup? ›

Wine is optional to deglaze the pan and add flavour to the soup. I recommend a dry white or red wine, such as a good quality Pinot Grigio/Gris, Sauv Blanc, Sémillon, Chardonnay, Merlot or Pinot Noir. Generally, if you can't drink it, don't cook with it.

Onion soup, at its very essence, is nothing more than onions and water boiled together. Period, done, finished, everything added from that point on is pure opinion. Caramelizing the onions brings out sugars, and makes a more luxurious silky and sweet soup, adding flour gently thickens and provides body.

"When a slow cooker is too full, it may not heat the food evenly," explains Leal. As a result, some parts of the dish may overcook, while others remain undercooked. "This can also increase the risk of foodborne illness, because the food might not reach a safe temperature throughout," she says.

Due to the nature of a slow cooker, there is no need to stir the food unless it specifically says to in your recipe. In fact, taking the lid off to stir food causes the slow cooker to lose a significant amount of heat, extending the cooking time required. Therefore, it is best not to remove the lid for stirring.

Foods take different times to cook depending upon the setting used. Certainly, foods will cook faster on high than on low. However, for all-day cooking or for less-tender cuts, you may want to use the low setting.

Infusing the soup with a richer taste is as easy as quickly sauteing crushed garlic before pouring the soup in. Some soft, buttery garlic sauteed in earthy olive oil is the perfect addition to enrich canned French onion soup.

A squeeze of citrus, a dollop of yogurt or a drizzle of cream, a dusting of cheese or a good chile powder, a sprinkling of some herbs or croutons — all can take a perfectly fine soup into the realm of the delectable. Even a spiral of good olive oil to finish and some coarse sea salt can do wonders.

Adding a parmesan cheese rind to the simmering soup infuses it with salty, umami flavor. This is SUCH an easy way to add tons of flavor to soup. Look for parmesan cheese rinds at the cheese counter in your grocery store.