Peel bananas, clean all fruit, dice them all and place in freezer bag (if strawberries are small, freeze them like that; no need to dice sour cherries)
When slightly frozen, add everything to a food processor, adding just a little fruit at a time. Gradually add the rest of the frozen fruit, waiting to completely incorporate into the mixture.
Add honey and vanilla sugar (or 1 tsp vanilla extract)
Serve immediately or freeze for later (add to cups before freezing and thaw a few minutes before serving)