Momordica cochinchinensis or Gac Fruit is one of these so called wonder fruits from Southeast Asian that has been traditionally used as both food and medicine in the regions in which it grows. It is a relative of the bitter gourd but Gac has been shown to be especially high in lycopene content. Relative to mass, it contains up to 70 times the amount of lycopene found in tomatoes. It has also been found to contain up to 10 times the amount of beta-carotene of carrots or sweet potatoes. There has also been recent research that suggests that gac contains a protein that may inhibit the proliferation of cancer cells. You will need both male and female vines to cross pollinate for fruit which may prove a bit of a challenge in the UK even under glass.