Preheat oven to 170 degrees, fan forced, and place rack into middle of oven
Grease and line 2 x 20cm round bake tins (base measurement) with baking paper (only line the base with paper, and well grease the sides with butter)
Add flour, cocoa powder, baking powder and salt into TM bowl and mix 10 seconds / speed 4 to combine, put aside, do not clean TM bowl
Place beetroot, buttermilk, raspberries, lemon juice, vinegar and vanilla into TM bowl and blend 20 seconds / speed 6, scrape around bowl, then blend again for 1 minute / speed 9 to puree into a liquid, put aside, do not clean TM bowl
Add sugar, butter, oil and eggs to TM bowl and blend 30 seconds / speed 4, scrape around bowl
Add half flour mix and half beetroot mix and blend 10 seconds / reverse / speed 4
Scrape around bowl, add the last of the flour and beetroot mixes and blend 10 seconds / reverse / speed 4, scrape around bowl then repeat 2 seconds / reverse / speed 4
If there is any flour on top that still needs to be mixed in do that with your spatula
Divide mix evenly between the two cake containers (approximately 810g per tin … I place each tin onto a digital scale and measure in the batter to get the exact amount into each tin to ensure even cake layers) and level the top
Bake for 30 to 35 minutes, or until a skewer inserted into the centre comes out clean (it takes exactly 35 minutes in my oven)
Cool in tin 15 minutes before removing to a cooling rack to cool completely, keeping the base piece of baking paper on in case you wish to freeze the cake layers as mentioned in the notes