Thick smoked haddock chowder

Fruit and vegetables

125g/4½oz frozen sliced leeks (or 1 medium leek, trimmed and finely sliced)

100g/3½oz frozen chopped onion (or 1 medium onion, chopped)

handful roughly chopped fresh flatleaf parsley leaves, to garnish (optional)

2 medium potatoes (approximately 200g/7oz each), peeled, cut into roughly 2cm/¾in cubes

100g/3½oz frozen sweetcorn kernels