Ingredients
- 2 teaspoons olive oil
- 1 large leek (about 6 ounces), white and light green parts thinly sliced, then rinsed and patted dry
- ½ teaspoon kosher salt
- ¼ pound pancetta, cut into 4 paper-thin slices (or buy it presliced)
- 2 tablespoons butter, at room temperature
- 8 slices sourdough bread, ¼ inch thick (or for a nuttier flavor, use rye)
- 6 ounces Italian Fontina cheese, coarsely grated
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