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Sweet onions, such as Vidalia or Walla Walla, will make this recipe overly sweet. Be patient when caramelizing the onions in step 2; the entire process takes 45 to 60 minutes. Use broiler-safe crocks and keep the rim of the bowls 4 to 5 inches from the heating element to obtain a proper gratinée of melted, bubbly cheese. If using ordinary soup bowls, sprinkle the toasted bread slices with Gruyère and return them to the broiler until the cheese melts, then float them on top of the soup. For the best flavor, make the soup a day or two in advance. Alternatively, the onions can be prepared through step 1, cooled in the pot, and refrigerated for up to 3 days before proceeding with the recipe. From America's Test Kitchen. http://bit.ly/VQoIRX
Units: US | Metric
Serving Size: 1 (539 g)
Servings Per Recipe: 6
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