Measure all ingredients. If your black pepper is very fine or your red pepper flakes are very large, adjust slightly so the overall texture stays coarse but not overly chunky.
2 tablespoons coarse kosher salt, 1 tablespoon black pepper, 1 tablespoon garlic powder, 1 tablespoon onion powder, 2 teaspoons paprika, 1 1/2 teaspoons crushed red pepper flakes, 1 1/2 teaspoons dried thyme, 1 1/2 teaspoons dried oregano, 1 teaspoon coriander seeds, 1 teaspoon dill seeds or dried dill weed
Place the coriander seeds and dill seeds (if using) in a small zip-top bag. Gently crush with the bottom of a heavy pan or a rolling pin until cracked but not powdered.
1 teaspoon coriander seeds, 1 teaspoon dill seeds or dried dill weed
Add the crushed seeds to a small mixing bowl along with the salt, black pepper, garlic powder, onion powder, paprika, crushed red pepper flakes, thyme, and oregano. Stir until evenly combined with no large clumps.
2 tablespoons coarse kosher salt, 1 tablespoon black pepper, 1 tablespoon garlic powder, 1 tablespoon onion powder, 2 teaspoons paprika, 1 1/2 teaspoons crushed red pepper flakes, 1 1/2 teaspoons dried thyme, 1 1/2 teaspoons dried oregano, 1 teaspoon coriander seeds, 1 teaspoon dill seeds or dried dill weed
Sprinkle a pinch of the seasoning onto a piece of buttered bread or a plain cracker and taste. Adjust the salt or crushed red pepper flakes as needed, keeping in mind the flavor will be more subtle once spread over meat.
Use a funnel to transfer the seasoning to a clean, dry glass jar or spice container with a tight-fitting lid. Label the jar with the name and date.
For the best flavor, let the homemade Montreal seasoning sit for at least 2 hours, or overnight, to allow the spices to mellow and blend.
To use on steak, pat the meat dry, lightly coat with oil, and sprinkle about 1 to 1 1/2 teaspoons of seasoning per side for a 1-inch-thick steak. Press the seasoning into the surface and let the steak rest 15–20 minutes before grilling or searing.