Several years ago, my husband and I vacationed in the lovely town of Lake Placid, in New York state. There we found a traditional diner offering a delicious breakfast option of plain yogurt topped with grapefruit and orange segments, and nutty granola. That combination inspired this citrus cheesecake tart. The cheesecake portion is lightly grapefruit flavored, but I always include orange segments as part of the garnish.