Ingredients
- 1 sheet puff pastry, defrosted per the package instructions
- 1/2 cup whole-grain mustard
- 1/4 cup smooth Dijon mustard
- 1/4 cup mayonnaise
- 9 slices provolone cheese (about 8 ounces)
- 20 slices mortadella (about ¾ pound)
- 1 large egg
- 1/4 cup cornichons, thinly sliced
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