Romaine is a lettuce believed to have come from Cos, an island in the Aegean Sea. The oblong head has dark green outer leaves and light green center leaves. Romaine has a crisp texture and a slightly bitter flavor.
Garnish this salad with springs of fresh herbs such as rosemary, basil, thyme or parsley.
Serve this European-style tuna salad with crusty bread and iced tea.