Oak leaf lettuce / Raisa
The oak leaf lettuce is named for its long, narrow, serrated leaves, resembling the shape of oak leaves. There are both red and green leaf varieties. Oak leaf lettuce is considered a loose-leaf lettuce; it doesn’t form closed heads but instead grows in open rosettes. Its extremely delicate leaves make it quite perishable, typically lasting only about a day in the refrigerator. In terms of flavor, it has a heartier taste compared to regular lettuce and often has a subtle resemblance to young hazelnuts.