In a large saucepan place both the smoked and unsmoked haddock (leave on skin). Add milk, vegetable stock, and thyme.
Bring to the boil, then remove from the heat to cool. This will not only cook the fish but infuse the liquid with its flavour.
After an hour (more or less) remove fish from liquid, remove skin and any bones and flake into pieces, not too small. Leave to one side as will be added at the end. Remove thyme sprigs and discard.
Heat vegetable oil in a large pan. Add onions, leek and garlic and sauté until soft (not coloured), about 8 minutes.
Add onion mix to liquid, along with sweet potato, lentils and drained sweetcorn.
Bring to the boil and simmer for about 30 minutes (check the cooking time on your lentils). Has a tendency to look a bit 'scummy' at this point. Don't worry, it's supposed to!
Using a hand blender, blitz until you have your desired consistency. It's nice to leave some chunkier pieces but if you want smooth, it's up to you. Check seasoning.
Add the flaked fish back into the chowder and reheat slowly.
Be careful not to stir too enthusiastically or you'll break up the fish pieces. Serve and enjoy!
Allow to cool completely before freezing. Defrost thoroughly. Bring up to boil slowly when reheating. Freezes really well.
You can pretty well use any smoked and unsmoked fish of this type (white fish) - oilier fish (salmon/tuna/trout) don't work.
Vegetarian option: Leave out the fish and use vegetable stock. Chicken: Poach chicken for about 20 minutes in chicken/vegetable stock and milk mix, everything else the same. Add extra sweetcorn at the end; gives a nice crunch. Use white potatoes. Add carrots when adding veg to liquid.
Used different ingredients.
I've tried this with different fish, it's equally good with cod and salmon; I've also tried the veg option, it's great with ordinary potato and root veggies and a big chunk of bread... - 31 Jul 2010
Tried this and it is an absolutely fabulous recipe! It was easy to make and you can try lots of different variations. It's great on the colder days when you want something hearty and filling or change the ingredients and you have a lovely summer snack. Excellent!! - 31 Jul 2010