Garlic Purée

• a whole string of garlic bulbs
• salt
• olive oil

Wrap the unpeeled heads of garlic together in kitchen foil and cook in the oven at 190°C (375°F, gas mark 5) for 1 hour. Leave them to cool, then unwrap them and skin them. Press the cloves through a sieve, cover with olive oil and keep in a jar in the f