Recipe: Tuna Puff Pastry

Recipe: Tuna Puff Pastry
Ingredients:
oil from the tuna
4 ounces mascarpone cheese mixed well with the juice of 1/2 lemon
2 dozen or more roasted cherry tomatoes, or the equivalent of another variety roasted tomato
1/2 cup Grana Padano or other hard Italian cheese, shaved or grated
2 generous handfuls arugula, well washed and well dried
2 sheets of puff pastry, rolled out slightly to form 12″ x 12″ squares
1 can Ortiz tuna, packed in oil. Reserve the oil.
2 teaspoons anchovy paste