Method
1. With a stand mixer fitted with the paddle attachment, beat the butter until it’s soft and smooth (it doesn’t have to be cold!)
2. Siftthe powdered sugar into the butter and beat for another minute or so, making sure to scrape down the sides of the bowl
3. Sift together the remaining sugar, flour and cashew meal
4. On low, speed, continue to beat the butter and slowly add the dry ingredients until it looks like wet sand
5. Add the egg to bring it all together
6. Transfer to a work surface and knead for a minute or so before forming a ball
7. Wrap in plastic and refrigerate at least two hours
8. Over medium heat, melt butter in a sauce pan
9. Stir in rhubarb and let cook about 3 minutes
10. Add maple syrup. Let cook another minute
11. Remove from heat. Stir in vanilla & rum followed by the flour
12. Let cool
13. Combine the sugar and molasses until the sugar is light brown
14. Stir in the flour and cinnamon
15. Add the butter and squeeze the mixture until it’s crumbly
16. At the last minute, mix in half an egg white to make it crunchy
17. Pre-heat oven - 190 °C / 375°F
18. Roll out the dough
19. Lay out the dough on the tart pans, and press the dough around the edges
20. Line with parchment paper and fill them with weights
21. Blind bake crust for about 10 minutes
22. Pour the filling into the tart shells
23. Bake for another 10 minutes
24. Sprinkle the topping onto the half-baked tarts
25. Return to the oven for another 20 minutes
26. Set aside to cool