Mustard roast beef with fresh tomato sauce

Bring a saucepan of water to the boil.
Cut a cross on the top of each tomato, then blanch for 1 minute, or until the skins start to detach from the flesh.
Remove and plunge into cold water. Peel, cut into quarters and discard the seeds, then slice very thinly.
Arrange on a platter, season to taste and drizzle with olive oil. Top with basil pesto and a scoop of star-anise sorbet.
To make the star-anise sorbet:
Place the sugar, water, glucose and Champagne in a saucepan over a low heat. Allow the sugar to dissolve, then turn up the heat and bring to a boil.
Add the star anise and cardamom and cook for 2 minutes. Remove from the heat and leave to infuse for 1 minute.
When cool, churn in an ice-cream machine according to the manufacturer’s instructions. Freeze.