My Grandmother's Heavenly Funeral Cake

Ingredients

• 1 ½ cups (190g) all-purpose flour
• 1 cup (200g) granulated sugar
• ½ cup (120ml) unsalted butter, softened
• 2 large eggs
• ½ cup (120ml) milk
• 1 tablespoon vanilla extract
• 1 teaspoon baking powder
• 1 teaspoon ground cinnamon
• ½ teaspoon salt
• Zest of 1 lemon
• 1 cup (120g) powdered sugar
• 2 tablespoons (30ml) milk
• ½ teaspoon vanilla extract
• Optional: a pinch of salt for flavor adjustment