In a pan poach the smoked haddock in 400ml of water with a bay leaf (you could use milk if you like, but don't forget to adjust calories etc accordingly!)
Mist a large frying pan with low calorie cooking spray and sweat an onion until it begins to colour
Add the residual poaching liquor to the frying pan together with a stock cube. Cook it on a high heat for 10 minutes, then turn off, cover & leave for 10 minutes