I use 1 cup/200g granulated sugar for this recipe. Feel free to add more sugar to your taste if you prefer.
If you prefer a deeper shade of red, then it is best to use a red gel type of food colouring. If you do not have the gel type, then go ahead and use the regular red liquid type of food colouring.
These cookies can be eaten or served as is or sandwiched with buttercream if you prefer.