Yoghurt and white chocolate ganache (Mark Best)

Vanilla bean powder

• 7 vanilla beans

Yogurt and white chocolate ganache

• ½ orange, zest only, no white pith (see Tips)
• 225 g white chocolate, broken into pieces
• 120 g pouring (whipping) cream
• 180 g Greek yoghurt
• 250 g fresh blueberries (see Tips)