Burgers with Brie and Grilled Pancetta

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Burgers:

1 slice sandwich bread, crusts removed and torn into pieces

3 tablespoons dry red wine (you can also use beef stock or milk)

3 tablespoons finely chopped chives

2 cloves garlic, finely minced

Kosher salt and freshly ground black pepper

1.3 to 1.4 pounds (600 to 650 grams) lean ground beef

Toppings:

Neutral oil, for grilling

2 slices red onion, about 3/8-inch (1-centimeter) thick

2 teaspoons olive oil

Kosher salt and freshly ground black pepper

3.5 to 4.4 ounces (100 to 125 grams) Brie cheese, sliced

8 to 12 thin slices pancetta

4 burger buns

1/2 stick (4 tablespoons/56 grams) unsalted butter, at room temperature, optional

Dijon mustard, for spreading

4 pieces leaf lettuce