Made with yogurt and olive oil, this is incredibly light and moist. It is drenched in an aromatic, thyme-infused lemon syrup, which, once cool, forms a delicate, crisp sugary shell. Served with an abundance of berries, it makes a wonderful centrepiece for an afternoon tea in the garden. The aroma of fresh thyme will always bring back indelible memories of the gardens at Highgrove and of the joy of being able to pick fresh herbs moments before they were needed for a cake.