Heat the oil in a pan. Sauté the shallot for approx. 5 mins., add the rhubarb and chilli, cook for approx. 2 mins. Add the balsamic, water, sugar and salt, cover and simmer for approx. 5 mins. until soft. Allow the stewed rhubarb to cool slightly, stir thoroughly.
Mix the fennel, dill and oil, season.
Toast the bread in a frying pan over a medium heat for approx. 2 mins. on each side. Remove, place the cheese on the slices of toast. Top with the stewed rhubarb and fennel.