Pre-heat oven to 180°C (356°F). Lightly grease a 10-inch springform pan with vegan butter or oil.
Combine strawberries, lemon zest, cornstarch, lemon zest and sugar. Set aside.
To make the soft crumble – combine all-purpose flour, brown sugar , ground cinnamon, salt and melted salted vegan butter together. Set aside.
Combine oat milk with apple cider vinegar. Set aside for 5 minutes to create vegan buttermilk.
Beat softened vegan butter and vanilla extract with sugar. Then, mix vegan buttermilk – it may look clumpy but that's ok!
Fold in self-raising flour, cornstarch, baking powder and baking soda.
Pour cake batter into the pre-greased springform pan. Top with jammy strawberries, soft crumble, and sliced almonds. Bake for 45-55 minutes. Baking time may vary, but you'll know the cake is done when a toothpick inserted in the centre comes out clean.
Remove cake from the oven and place on a cooling rack. Allow to cool for around 10 minutes before slicing.
Notes
If you don’t have salted vegan butter, you can use un-salted vegan butter or coconut oil but you may want to add 1/4 tsp or so, or salt!