Active ingredients: 1 (1-pound) trimmed beef tenderloin, cut into 24 cubes (about 3/4 inch each),1/ 4 teaspoon newly ground black pepper,1/ 3 cup Boursin cheese,4 to 5 crimini mushrooms or button mushrooms, chopped,1 big egg, lightly beaten,1 tablespoon additional virgin olive oil,1/ 2 teaspoon finely sliced fresh rosemary,1 (173- ounce) plan frozen puff pastry dough, thawed, Sea salt
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