Soak the dried rose petals in a bowl of cold water with the rose essence for 20 minutes (this rehydrates the petal and gives it more flavour), then drain and set aside.
Butter the bread, then spread the honey over 6 of the slices.
Divide the rose petals between the 6 slices of honeyed bread and top with the remaining bread slices. Cut off the crusts with a serrated bread knife, cut each round diagonally into 4 sandwiches and serve immediately.
If growing the roses yourself never use pesticides.