Measure out your flour into a large bowl.
Add the salt and baking powder, mix and set aside.
Cream together the butter and sugar. Either use a hand whisk, stand mixer or the attachement on your food processor
Whisk together in a small bowl or mixing jug all the other ingredients, including the aquafaba.
Bit by bit add the liquid and the butter mixture to the flour, beatuing it until you have a smooth batter.
Pour the batter over the prepared pineapple rings, smooth out and bake for 45 minutes.
Check to see how it is cooking at 30 mins,If the cake is looking like it might burn, but it isn't cooked all the way through, pop some aluminium foil over the top.
The cake is cooked when a skewer or chopstick comes out clean.
Leave to cool in it's tin for 20 minutes.
Then run a butter knife around the tin, to loosen the edges. Put the plate or cake stand you wish to serve the cake on over the tin.
Then FLIP carefully but quickly! Give the base a gentle tap and the cake should whoosh out cleanly, courtesy of all that butter we used to line it with!
Leave to cool completely and serve as is, or with vegan whipped cream or icecream!