Lady fingers are long sweet sponge cookies. By themselves, they're not very exciting but you can really kick up a dessert by adding them as dippers or crumbled and mixed through some whipped cream. They can be a little tricky to find in the summer months. Tiramisu is more of a fall/winter kind of dessert so you'll have better luck finding them in the store then. But it's not impossible earlier in the year, I found mine at Whole Foods Market and you should be able to track them down in the packaged cookie section.