We found that store-bought ladyfingers can vary from soft (like cake) to hard (like biscotti). Savoiardi-brand ladyfingers have the perfect light, crisp texture and hold their shape best. If not available, lightly brush the espresso onto the soft variety. The firmer variety should be soaked in the espresso longer. For a slightly boozier tiramisu, use 4 tablespoons of the sweet Marsala in the espresso mixture.