Tuna Pasta Bake

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.

A big pan of boiling water is the most dangerous thing in most home kitchens. Go slowly.

1. Put a colander in the sink BEFORE you pick up the pan.
2. Use oven gloves or a thick tea towel on both handles. Tip the pan away from you so the steam rises away from your face.
3. For pasta, scoop out a mugful of the cooking water first — its starch helps the sauce stick.
4. For tins, press the lid against the food and tip the liquid out over the sink, or use a sieve.

Softening cooks the raw sharpness out of onions and turns them sweet. It is the start of most sauces, stews and curries.

1. Heat the oil over medium heat, add the onion and a pinch of salt (it draws out water and speeds things up).
2. Stir every minute or so. You want a gentle sizzle, not a loud fry.
3. After about 5–8 minutes the pieces go glossy, floppy and see-through at the edges. That is 'softened'.
4. Keep going another few minutes and they start turning golden — sweeter still. Only do that if the recipe says 'golden'.

Ready when: Floppy, shiny and slightly see-through, with no raw crunch when you taste a piece.