Pick the violets, rinse and drain. Place in a bowl and cover with boiling water and a drop of lemon juice. Cover and leave overnight. Drain and save the purple water into a pot. Add equal parts of sugar (I had 200ml water, 200g sugar). Boil until the syrup bubbles and add the violets. Patiently pick them up with a teaspoon and let the dry (it may take a few days). I used the leftover sugar to candy chestnuts, but any other fruit would do. Store your violets in a jar.