The picnic spread included various relishes for the hot dogs.

relishes 是 relish 的复数形式，relish 作为名词指"调味酱"，特别指用来增添食物风味的各种酱料，比如搭配热狗或汉堡的酸黄瓜酱、芥末酱等。这个词也可以指"风味"或"享受"。