Add sugar, water, vinegar, and salt to pot and and turn on to medium high heat.Mix and combine until sugar fully dissolves, approx 2-3 minutesTake off heat and allow to fully coolPeel daikon radishes and cut into ½ inch round discs. Take each disc and cut into ½ inch cubes and set asidePlace cubed radish into jar and pour pickling liquid over. Seal and place in refrigeratorEnjoy the radish cold!