Attach the sticky side of a shorter piece of masking tape to the sticky side of a larger piece. Place the tape across the top of a powder container so that the ends adhere to the sides. The next time you scoop, you can easily level off your helping.
I never was a fan of those cedar blocks for grilling fish. I think this is a great idea, though! The Husband loves lemon on his fish, too - Bonus! Grill your fish on a bed of lemons to infuse flavor & prevent sticking to the grill.