Beer and Coconut Cake with cream cheese icing

• 300 gm caster sugar 1 1/2 cups
• 230 gm butter unsalted
• 4 whole eggs separated
• 1/2 cup coconut desiccated fine
• 300 gm flour 2
• 1 teaspoon baking soda
• 1/4 teaspoon salt
• 150 ml beer just over 1/2 cup
• 1 whole lime or lemon zest only

Frosting

• 350 gm butter softened
• 250 gm cream cheese softened
• 360 gm icing sugar sifted, 3 cups
• 60 ml lime juice or lemon juice
• 60 ml beer
• 1/2 cup toasted coconut threads
• 25 gm pepita seeds toasted