Orange and Marmalade Cake

Sponge

• 150 g unsalted butter, soft, plus extra for greasing
• 150 g golden caster sugar
• 100 g Seville orange marmalade, thick cut
• 150 g self-raising flour
• 3 medium eggs
• 1 orange, cut in slices (3 mm)

Glaze

• 50 g Seville orange marmalade
• 40 g orange juice