Clementine and Poppy Seed Buttermilk Scones

• 35 g caster sugar
• 2 clementines, thin peelings of skin only
• 250 g self-raising flour, plus extra for dusting
• 60 g salted butter, cold, diced
• 1 tsp baking powder
• 120 g buttermilk
• 2 Tbsp poppy seeds
• 1 egg, beaten

Vanilla Butter

• 150 g salted butter, soft
• 1 tsp vanilla bean paste