Valentine's Marbled Cake

White Cake Batter

• 10 oz whole milk, room temperature
• 1 tbsp lemon juice
• 6 oz unsalted butter, in pieces, softened to room temperature, plus extra to grease
• 2 oz vegetable oil
• 12 oz sugar
• 6 egg whites, from large eggs, room temperature
• 12 oz all-purpose flour
• 3 tbsp corn starch
• 2 ½ tsp baking powder
• ½ tsp baking soda
• ½ tsp salt
• 1 tsp almond extract
  ou 1 tsp vanilla extract
• 3 - 5 drops pink food coloring
  ou 3 - 5 drops red food coloring

Buttercream

• 12 oz unsalted butter, in pieces, softened to room temperature
• 16 oz confectioners sugar
• 1 tbsp heavy cream, room temperature
• ½ tsp almond extract