Poach the cod after soaking it overnight. Mince it up with a knife. Put it into a bowl and start stirring it, drizzling in olive oil and cream as you do. Add garlic, lemon and S&P. Learned that off Keith Floyd on the telly years ago. Very good with french bread and a cold white or rosé ... as you might expect. Some recipes mix in potatoes then cover the lot with cheese and grill it. I dunno about that.