Food Network teaches how to crush, slice and mince garlic. Peel off some of the papery skin from the garlic and then smash the head of garlic with the heel of your hand to loosen the cloves; if you only need a few cloves, leave the head intact and pull some off. Separate the cloves. To peel a clove, cut away the root end with your knife. Lay the flat side of the knife over the clove while holding the knife handle, then with the heel of your free hand carefully whack the knife against the garlic to separate the skin from the clove. To crush the peeled garlic, lay the flat side of the knife over the clove and smash it again. To slice peeled garlic, lay the clove flat on the cutting board and hold it with the fingertips of one hand, keeping them curled under. Using a rocking motion with the knife, make thin slices by moving the knife slowly across the clove. To mince peeled garlic, lay the flat side of a knife over the clove and smash it. Roughly chop the clove then move your free hand flat across the tip of the knife and use a rocking motion to chop the garlic until it’s finely minced.
Drain all but a tablespoon of olive oil from the tuna and then flake the fish into the bowl of a food processor fitted with the steel blade. Add the anchovy paste, thyme, parsley, lemon zest, and garlic and pulse a few times. Add the lemon juice, 3 tablespoons of olive oil, and the mascarpone and process until almost smooth. Add the olives, capers, salt, and pepper and pulse just to incorporate. Transfer the mixture to a bowl, cover with plastic wrap, and refrigerate for at least 1 hour.
Meanwhile, heat a gas or charcoal grill or preheat the oven to 375 degrees. Brush the bread lightly on one side with olive oil. Grill the crostini on both sides until lightly browned or arrange the bread on a sheet pan and bake for 6 to 8 minutes. Allow to cool slightly.
Mound the tapenade on each toast, sprinkle with parsley, and serve.
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