Keep a few spoonfuls of the bean liquid before draining. It is starchy, and it loosens the mash without thinning the flavour the way water does.
- Mash the drained beans with a fork, most broken, a few left whole.
- Garlic granules, lemon juice, pepper. Oil trickled in while stirring.
- Loosen with bean liquid a spoonful at a time until it drops from the spoon.
- Fold the drained tuna and the capers through last, gently, so the tuna stays in flakes.
Folding rather than stirring at the end is the whole difference between this and paste.
Serves 3 on crackers or oatcakes, 2 as a meal.