How to Make French Onion Soup:
Cut onions in half, cut off the ends, then peel and slice onions thinly (cut parallel with the grain of the onion).
In a large heavy-bottomed pot or dutch oven over medium heat, add 2 Tbsp olive oil and 2 Tbsp butter. Add sliced onions and sauté uncovered, stirring occasionally for 10 minutes.
Sprinkle the onions with 1/2 tsp sugar which will help the onions caramelize faster. Sauté uncovered for another 30-40 minutes, stirring occasionally until onions are caramelized and browned. Stir more frequently towards the end to prevent scorching or burning the onions.
Once onions are caramelized, add minced garlic and sauté another minute.
Add 1/2 cup sherry and deglaze the pot by scraping the bottom. Continue stirring until all of the sherry has cooked out (about 3 minutes over medium heat).
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