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.
For the toasts: Place an oven rack in the center of the oven. Preheat the oven to 375 degrees F. Arrange the bread slices in a single layer on a heavy baking sheet. Drizzle both sides of the bread with the oil. Season with salt and bake until light golden, about 10 minutes. Cool for 1 minute, and then rub the toasts with the cut side of the garlic.
For the crab: In a small bowl, gently combine the crab, lemon juice, chives, and salt.
For the mayonnaise: In a small bowl, combine the mayonnaise, yogurt, lemon zest, salt, and cayenne pepper.
Divide the crabmeat evenly and place on top of the toasts. Dollop with about 1 teaspoon of the mayonnaise mixture and serve immediately.