Red Oak Leaf lettuce is small to medium in size and has elongated, lobed, and loosely serrated leaves similar to those of oak leaves. The vibrant, burgundy stained leaves connect to a lighter red, central base and form a semi-tight rosette, growing upward into a loose top. The leaves are also tender, smooth, and broad with many curls and frills. Red Oak Leaf lettuce has a buttery texture and a mellow, nutty, earthy, and sweet flavor.