Baked trout with a pistachio crust

I cheated with a frozen potato dauphinoise thingy - but it's fresh trout, with a crust of ground up pistachios  and steamed veg … potato thingy baked (as per packet instructions) for 25 minutes, fish for 15 and veg steamed.  It's not a recipe, but it was lovely, so I thought I would include it.