Super Easy Lemon Pudding, a British Classic

Ingredients (8)

• 2 oz./50 g. unsalted butter (at room temperature, plus extra for greasing)
• 8 oz./225 g. golden caster sugar
• Finely grated zest and juice of 2 large lemons
• 4 large free-range eggs (separated)
• 2 oz./50 g. self-raising flour
• 1 cup/225 mL whole milk
• 1/2 level teaspoon cream of tartar
• Garnish: icing (or powder sugar for sprinkling)