This mildly spicy cilantro sauce is an excellent match for potatoes and particularly suited to new potatoes. Both true new potatoes that are harvested with super-thin skins and come in a range of sizes and the teeny-tiny bite-size potatoes often labeled "New potatoes" At markets. You don't need any particular type of potato, though. Feel free to just cut giant russet potatoes into bite-sized pieces and proceed from there