Put your sliced vegetables into the bottom of your pot, then place a trivet on top of them so it sits flat on bottom.
Place fish fillets on trivet. Pour your broth or water on top of the fish so it drains down on top of everything. Mix spices together and sprinkle over the top of each piece so they're seasoned. Can sprinkle fresh parsley on top too if you wish.
Put 1 tbsp of butter on top of each fillet. Close lid and steam valve and set to high pressure for 8 minutes. Then do a quick release when done.
Lift out trivet and serve fish on plates with sides of veggies. Season again with a pinch of salt and pepper if you wish, according to taste.