For the Cake

• 2 1/2 C All Purpose Flour
• 2 1/2 tsp Baking Powder
• 1/4 tsp Salt
• 8 TBSP (1 Stick) Unsalted Butter (Room Temp)
• 1 3/4 C Granulated Sugar
• 2 Lg Eggs (Room Temp)
• Zest of 1 Grapefruit
• 1/2 C Broiled Grapefruit Juice (Strained)
• 1 tsp Pure Vanilla Extract
• 3/4 C Buttermilk (Room Temp)

Lime Buttercream

• 3/4 C (1.5 Sticks) Unsalted Butter (Room Temp)
• 3 C Powdered Sugar
• 1 tsp Pure Vanilla Extract
• Zest and Juice of 1 Lime (2-3 TBSP lime juice)