Method

1. Start by making the basil mayonnaise. Mix together the egg yolk with the mustard and crushed garlic in a small glass.
2. Mix in the vinegar and then add the oils gradually whilst stirring.
3. Mix in the basil and and season to taste with salt and pepper.
4. Roast the prawns in a dry hot pan until they start to brown.
5. Add the chopped red chilli (deseeded) and the finely-chopped celery plus some coarsely-ground black pepper.
6. Serve the prawns immediately with some toast and basil mayonnaise.