Rainbow Trout Caviar Arrives chilled, never frozen. Trout roe caviar has small to medium sized grains, and is beautiful to look at, thanks to its vibrant color and very special flavor. This roe, from the finest farm-raised European rainbow trout, produces a pristine caviar with a mild and delicate flavor. The vibrant orange, medium size grains of our trout roe exude a crisp, briny tang. Best enjoyed on a blini or toast point, with a dollop of crème fraîche, or finish off any fish dish or salad with this visually appealing roe.