Add Flax meal to a bowl and pour over the warm water and mix. Set aside
In a bowl add the vegan butter, sugar, ground almond, corn starch and almond essence. Mix to combine.
Add the flax mix and combine well.
Preheat the oven to 180ºC ( Fan Assisted oven )
Cut the plums in half and remove the stones. Slice each half thinly, discard the ends (eat them!)
Remove the tart base from the fridge.
Transfer the frangipane mix onto the prepared tart base. Press down and spread. Using a spatula, smooth out evenly.
Decorate with the plums. Start from the outside edge, place the plum slices next to one another, slightly overlapping the next, creating circles moving towards the centre.
Bake the tart in the oven for about 30 minutes or till golden.
Once baked, brush the plums with maple syrup.
Serve warm with Nicecream.