Chocolate Cake with Strawberry Filling

Ingredients

For the Chocolate Cake:
• 2 cups all-purpose flour
• 1 ¾ cups granulated sugar
• ¾ cup unsweetened cocoa powder
• 2 tsp baking soda
• 1 tsp baking powder
• ½ tsp salt
• 1 cup buttermilk (or 1 cup milk + 1 tbsp vinegar, let sit for 5 minutes)
• ½ cup vegetable oil
• 2 large eggs
• 2 tsp vanilla extract
• 1 cup hot coffee (or hot water)
For the Strawberry Filling:
• 2 cups fresh strawberries, chopped
• ⅓ cup granulated sugar
• 1 tbsp lemon juice
• 1 tbsp cornstarch + 2 tbsp water
For the Chocolate Frosting:
• 1 cup unsalted butter, softened
• 3 ½ cups powdered sugar
• ½ cup unsweetened cocoa powder
• ½ cup heavy cream
• 2 tsp vanilla extract