1 lemon, juice only
500g/1lb 2oz ripe strawberries, hulled, plus extra to serve, sliced
1 heaped tsp icing sugar, sifted
150²µ/5Β½΄Η³ϊ sugar
Β½ tsp vanilla paste or seeds scraped from 1 vanilla pod
150ml/ΒΌ pint double or whipping cream