This recipe makes 4 servings
8 slices French bread or Italian bread, (3/4 inch/2 cm thick)
1/4 cup (50 mL) grainy mustard or Dijon mustard
4 oz (113 g) old cheddar cheese
4 thin slices sweet onions
3 tbsp (45 mL) butter, softened

Spread 1 side of each slice of bread with mustard. Using cheese slicer, thinly slice cheese; arrange half on half of the bread slices. Top with onion and remaining cheese. Sandwich with remaining bread, mustard side down. Spread butter over both sides of sandwich. (Make-ahead: Wrap in plastic wrap; refrigerate for up to 4 hours.)
Place on greased grill over medium-low heat; close lid and grill, turning once, until golden and cheese is melted, about 10 minutes. Cut in half.
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