A Masterclass in Patience The secret to extraordinary French onion soup is time. You cannot rush caramelized onions. They need low heat, patience, and about 45 minutes to transform from sharp white slices into sweet, golden, deeply flavored ribbons of pure magic. How to Make It Melt butter in a heavy pot. Add the sliced onions with a pinch of salt and cook on medium-low, stirring occasionally, for 40-45 minutes. Yes, really. They should be deeply golden, sweet, and jammy. Add the wine and