In a saucepan, melt the butter / margarine (I use half-half, because although I normally never cook and bake with margarine, the pure butter taste would be too intense for me) with the syrup and sugar on a low flame (do not cook !! ). Cut the fresh ginger into very small (approx. 1 mm) cubes or finely chop and add the candied ginger. Stir in the oat flakes - and optionally also 1-2 tablespoons wheat flour for better binding.
Spread on a small (approx. 30 cm) baking sheet lined with baking paper and bake on the middle rack for 20-30 minutes at 180-190 ° (if in doubt, shorter, if too brown, they will be hard).
Don`t be alarmed: they seem to simmer rather than bake in the oven and are almost liquid due to the caramelized sugar when they are removed.
After 5 (up to max. 10!) Minutes, cut into 3 cm squares (this is best done with the pizza cutter).
Then let cool down completely and store in a tin can. They hold up very well for at least 4 weeks.