Pop the onion into a large nonstick pan, preferably one with a lid. Peel the garlic and halve the cloves lengthways or dollop in the paste. Add the carrot and swede. Drain and thoroughly rinse the butter beans and brown lentils and add those too. The pan should be entirely off the heat at this stage.
Pour over the passata or chopped tomatoes, then add the wine, stock, balsamic vinegar a