Frangipane is a French or Italian (depending who you ask) pastry filling typically made from almonds, although you can make it with pretty much any nut you want. It's rich and buttery, smooth and creamy and pairs wonderfully with fruit. Oftentimes it's flavored with almond extract, but I don't love the flavor of almond extract so I use vanilla instead. That way the flavor from the almonds is toasty and nutty, rather than artificial tasting.