Jamie Oliver fennel salad with gem lettuce recipe on 15 Minutes Meals July 11, 2015July 11, 2015admin Jamie Oliver served up a tasty fennel salad with gem lettuce on 15 Minutes Meals. The ingredients are: 1 bulb of fennel, 1 gem lettuce, 1 bunch of fresh mint, 1 lemon and shavings of Parmesan cheese.