---
title: French Onion & Kale Soup with Gruyere Croutons
source:
  name: HelloFresh
  url: https://www.hellofresh.com/recipes/french-onion-kale-soup-with-gruyere-croutons-5654b7d479a23cc5148b4567
servings: 2
prep time: 10 minutes
cook time: 40 minutes
time required: 50 minutes
difficulty: Medium
allergens: [Soy, Wheat, Milk]
tags: [Veggie, Soup, Comfort Food]
rating: 3.5
rating_count: 467
source_chef: Recipe Development Team
review_highlights:
  - theme: Flavor
    text: Deeply caramelized onions with umami-rich soy sauce and thyme
  - theme: Texture
    text: Gooey cheesy croutons add a satisfying crunch
image: "https://images.recipes.furrysalamander.com/Soup%20Recipes/Veggie/french-onion-kale-soup-with-gruyere-croutons.avif"
---

Halve, peel, and thinly slice @yellow onion{2%units}.

Heat @butter{1%tbsp} in a #large pot{} over medium heat. Add the onions and cook, tossing, until very soft and beginning to caramelize ~{10%minutes}. Add @sugar{1%tsp} and cook, tossing occasionally, until dark brown and completely caramelized ~{25%minutes}. -- Tip: If the bottom of the pan begins to burn, add a splash of water and scrape up the browned bits with a wooden spoon.

Preheat the broiler to 500°F. Thinly slice @demi-baguette{1%unit} on an angle. Halve 1 @garlic{2%cloves} clove, then mince the remaining clove. Strip the @thyme{1%sprig} leaves off the stem and roughly chop them. Remove stems and ribs from @tuscan kale{1%bunch}, then thinly slice the leaves into ribbons.

When the onion is fully caramelized, stir the minced garlic and thyme into the pot and cook until fragrant ~{30%seconds}. Stir in 3.5 cups water, @veggie stock concentrate{2%unit}, and @soy sauce{1%tbsp}. Bring to a boil, then reduce to a low simmer ~{5%minutes}. Stir the kale into the soup to wilt. Taste and season generously with salt and pepper.

Meanwhile, place the baguette slices on a #baking dish{} and place in the oven until toasted and slightly golden brown ~{2%minutes}. Remove from oven and rub the bread with the halved garlic clove. Sprinkle the toasts with @gruyere cheese{1%cup}. Return the baking dish to the oven until cheese is bubbly ~{2%minutes}.

Serve the French onion soup divided between bowls and top with a few gruyere croutons. Serve remaining gruyere croutons on the side for dipping. Enjoy!