Soften onion and celery in pan with
oil for 10 mins. Add bacon, then fry for
3 mins, until beginning to brown. Add
garlic, then cook for 30 secs. Pour in
tomatoes and stir through tomato purée,
treacle or sugar and vinegar. Simmer
over a high heat until thickened, between
5-10 mins, stirring often to make sure
mixture doesn’t catch. Gently stir beans
through, then cook for a further 2-3 mins
on medium heat, until heated through.
Meanwhile, make mash. Boil potatoes
until tender, about 15 mins, then drain.
Mash with milk, cheese and seasoning.
3 Fill 2 small microwave-safe bowls
three-quarters full with bean mixture.
Add a generous dollop of mash to top,
smooth over with a spoon. Chill when
cool (or freeze for up to a month at this
stage). Place small plate on top of dish,
then microwave on High for 3 mins or
until piping hot.