Red Velvet Cheesecake

All-purpose flour 120 g

Caster sugar 200 g

Cocoa powder ½ tsp

Beetroot powder 20 g

Red food colouring ½ tsp

Baking powder 1 tsp

Salt ½ tsp

Eggs 4 units

Vinegar 1 tsp

Milk 60 g

Oil 60 g

Zest from one whole orange