Crab and Watermelon

1. Infuse the lovage with the stock and simmer over a medium heat. Pass through a sieve and add a touch of green food colouring.
2. Place the stock in Thermomix and bring to 100°C, add the gellans at speed 4 and mix at 95°C for a further 2 minutes. Pour onto a flat metal tray to cover a thickness of about 1mm.
3. Leave to cool. Once cool, cut into squares of approximately 10cm.
4. For the watermelon, peel and trim the fruit and slice into pieces approximately 1cm thick, choosing the best pip free areas. Cut into rectangles approximately 4 x 7cm.
5. Put the pieces in a vac pac bag and vacuum. Then release from the bags; this compresses the juices and makes the watermelon transparent but bright red.
6. For the crab, use fresh white crab meat. Check for shells and cartilage. Add the mayonnaise to bind, then add the seasoning and chives.
7. For the cucumber ketchup, bring the cucumber juice up to 100°C in the Thermomix. Add the gellans and blend for a further 2 minutes.
8. Pour into a deep bowl. As it cools, use a stick blender to break up the setting gel. Continue this until the gel is cold and fluid.
9. Add the vinegar and sugar whilst still blending. Pass through a fine sieve; you should have a thick fluid gel. Spoon into a piping bag.
10. To serve, place the watermelon on the plate. Fill the lovage gel with the crab mix and roll over, ensuring it is tightly wrapped.
11. Place on top of the watermelon, garnish with flowers.
12. Pipe dots of cucumber ketchup and serve.

From http://www.greatbritishchefs.com/recipes/crab-and-watermelon-recipe