After half an hour or so, remove any scum that rises to the surface with a ladle or a large spoon. Repeat as necessary. Top up with cold water if the chicken is left uncovered. At the end of the ...
Drain the tomatoes through a sieve over a jug, pressing very lightly with the back of a spoon or ladle until about half the juice has been removed (see Recipe tips). Tip the tomatoes into a bowl ...