Mix ground flax seed with 5 tbsp. water and let it soak for some minutes.
Preheat oven to 180 °C (356 °F) fan/circulating heat.
Sift the flour into a big bowl. Add ground almonds, coconut or cane sugar, 1/2 tsp. nutmeg, 2 tsp. cinnamon, 1 small tsp. cardamom and a dash of salt and mix together. Add 2 tsp. baking powder and 1 tbsp. of apple vinegar (or lemon juice). Peel the ginger with a spoon, grate it and add the flesh and juice to the ingredients. Add soaked flax seeds.
Add coconut oil and plantbased milk and stir into a soft dough.
Open springform pan (9.8 inch/25 cm diameter) and place a baking sheet over the bottom. Close the springform pan and cut the baking paper on the outside. Pour the dough into the springform pan and spread evenly with a spoon.
Wash and slice 2-3 apples.
In a pot melt the margarine and stir in 1 tbsp. lemon juice and 3 tbsp. maple syrup. grate another piece of peeled ginger and add to the margarine.
Layer the apple slices on the prepared dough and douse with the melted margarine. Add some cinnamon. I also added another tbsp. of ground almonds.
Bake the apple pie for 35-38 minutes at 180 °C (356 °F) fan.
Remove the golden and fragrant apple pie from the oven and let it cool down for about 20 minutes. Use a knife to dissolve the pie from the springform pan and open it. Serve immediately and drizzle with some additional maple sirup.