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Melt half of the butter in nonstick skillet set over medium heat; cook onion, sugar, vinegar, Worcestershire sauce, thyme and rosemary, stirring occasionally, for about 20 minutes or until onion is soft and caramelized. Let cool to room temperature; fold in Gruyère.
Spread mustard evenly over 2 slices of bread. Top with onion mixture; top with remaining bread. Spread remaining butter over outside of sandwiches.
In nonstick skillet set over medium-low heat, cook sandwiches for 5 to 7 minutes per side or until cheese is melted and bread is golden brown.
Metro Richelieu inc. , its affiliated companies and affiliates are not responsible for any circumstance that should come up when using the suggested recipes. Each person using this site must check that each of the ingredients is allowed in his/her diet and is not part of his/her restricted foods.