SWEET SUSINA: The Art Nouveau-ish touches, the rows of butter-y biscuits, the special holiday menus. Susina Bakery on Beverly Boulevard is a favorite LA bakery for many reasons. This week our reason is all the heart-shaped cakes on the Valentine's order-ahead menu. The flavors include chocolate, vanilla, and, oh yes, red velvet. Plus there's an intriguing choice called the Saint Honore, which involves sponge cake, pastry cream, and handmade puff pastry. DELICIOUSNESS A DEUX: A six-inch cake is perfect for two or three people and is $25; call Susina now.