When it comes to substituting sherry in French Onion Soup, you've got a few options - and some are definitely better than others. You could try using dry white wine, like a Sauvignon Blanc or Pinot Grigio, which will give you a similar acidity and a hint of fruitiness. But, will it be the same as using sherry?
Another option is to use chicken or beef broth with a splash of red wine vinegar - it's not a perfect substitute, but it'll give you some of that savory, umami flavor that sherry provides. Or, if you're feeling fancy, you could try using a balsamic glaze, which has a rich, sweet-and-sour flavor that might just do the trick.
But, here's the thing - when you're substituting sherry in French Onion Soup, you're not just looking for a one-for-one replacement, you're looking for something that'll add depth, complexity, and a certain richness to the dish. So, you've got to think about what sherry brings to the table - and that's a nutty, caramel-like flavor that's just hard to replicate.
French Onion Soup With Dry Sherry - Cuisine Adventures