Blair Azzopardi knows his sausage rolls – those British staple snacks that are essentially sausages inside a baked pastry log. He ate his fair share of the flaky, savoury pastries as a child, which inspired him as an adult to try making them for his family. Azzopardi, a 43-year-old quantitative analyst living in the English county of Kent, has been vegan for six years. But that isn’t an obstacle...