Apple tarts deliver a more concentrated apple flavor than the more common double-crust pies, and you don't have to wait hours for them to cool. Using different apple varieties pays off in both taste and beauty here. A peeled Granny Smith makes a tart center; unpeeled Pink Ladies give the outer petals a delicate blush. A mandolin makes quick work out of thinly (and evenly!) slicing the apples, and a little grated ginger mixed with apricot jam provides a spicy-sweet base that lets the fruit truly blossom.