Key Lime Pie

Base

• 5 oz unsalted butter, cut into pieces, plus extra to grease
• 9 oz graham crackers
• 1 oz sugar

Filling

• 2 key limes, thin peel only, no pith
• 1 tbsp sugar
• 4 egg yolks, from large eggs
• 14 oz sweetened condensed milk (approx. 1 can)
• 3 ½ oz key lime juice (approx. 12 key limes)