The onions may cook faster and dry out more quickly, as any moisture that seeps out will evaporate a little more quickly. Onions for French onion soup are usually cooked over low heat for a long time, but you’re cooking these over medium heat for a few minutes. Keep stirring them as they cook to reduce the risk of them sticking to the bottom of the pressure-cooker.
Ingredients
1/3 cup butter
3 pounds onions, thinly sliced (10 cups)
2 garlic cloves, minced
2 tablespoons sugar
4 cups beef stock
4 cups chicken stock
3/4 cup white wine
1 teaspoon salt
optional: salad croutons and grated parmesan cheese
Directions
Select saute setting on a 6-qt. electric pressure cooker and adjust for medium heat; add butter. Add onion; cook and stir until tender, 6-8 minutes. Add garlic and sugar; cook 6 minutes longer. Stir in stocks, wine and salt. Press cancel. Lock lid; close pressure-release valve. Adjust to pressure-cook on high for 8 minutes.
Let pressure release naturally for 3 minutes; quick-release any remaining pressure. If desired, serve with croutons and Parmesan cheese.