This recipe features delicate bread layered with a flavorful herb spread accented with horseradish or spicy mustard. The sandwiches are assembled ahead of time, allowing the flavors to meld overnight, resulting in a crisp texture with a flavorful, mildly spicy filling and a visually appealing bite-sized presentation.
For a milder flavor, reduce horseradish or omit the spicy mustard. These sandwiches keep well for up to two days if kept wrapped tightly in the refrigerator.