Tuna & Lemon Pasta

The zest (the coloured skin) holds the fragrant oils; the white pith underneath is bitter.

1. Zest first, while it is whole: rub it over the fine side of a grater, turning as you go, taking only the coloured layer.
2. To juice, roll it firmly on the worktop under your palm, cut it in half across the middle and squeeze over your cupped hand or a sieve to catch the pips.

Ring-pull lids have razor-sharp edges once open.

1. Pull the ring slowly and steadily towards you, keeping fingers away from the lid's edge.
2. Don't press food down with your fingers inside an open tin — use a spoon.

Plenty of salty, fast-boiling water and a taste near the end are the whole secret.

1. Use about 1 litre of water per 100 g of pasta. Bring it to a rolling boil, THEN add salt — about a level teaspoon per litre.
2. Add the pasta and stir for the first minute so it doesn't stick together. No oil needed.
3. Start tasting a piece 1–2 minutes before the time on the packet. 'Al dente' means soft but with a slight firm bite in the very middle.
4. Before draining, scoop out a mug of the cooking water. A splash of it makes sauces glossy and helps them cling.
5. Drain, don't rinse, and mix with the sauce straight away.