976bar,
mackerel works best for me grilled over hot coals or bbq.
i think best as you say to get the sauce something like then decide on the fish. i'm still hoping on the makerel but salmon is close on the omega3.
this is the recipe i've had my eye on for a while but there are too many "no no" in it. it may help with you journey.
onions 2 off chopped
garlic clove 1 off chopped/crushed
3 tbsp oil
1 tbsp plain flour
1 tbsp madras curry powder
75g coconut flour
75g creamed coconut
400g tin coconut milk
570 ml fish stock
25 mm cinnamon stick
6 off cardamom pods
1 tsp fenugreek
salt & pepper
my thoughts were something along the lines of
del: plain flour, creamed coconut, fenugreek, salt & pepper.
add: red chilli, thai fish sauce, fennel seed
had a peak at Tomdips links. jumping out is a little tad of fresh ginger and fresh coriander. i've looked at a lot of recipes but none really seam to fit what i'm after and see this as needing a bit of trial and error for sure to get it right.