Preheat oven to 425F.
Line a baking sheet with foil.
Combine spices in a bowl and mix well. Add the mustard oil to create a paste.
Rub the paste onto the salmon using your fingers.
Put the salmon on the baking sheet (skin-side down), then put it in the oven.
Bake for 4-6 minutes per half-inch thickness (I typically roast for 10 minutes total).
The fish is done when flaky.