Step 1

To make the seasoning mix, whisk all ingredients together and store in an airtight container. The mix should keep well for at least three months.

Step 2

To make the mango avocado salsa, mix all ingredients in a medium bowl. Taste and adjust the seasonings if desired.

Step 3

To make the grilled blackened tuna steaks, heat a grill over high heat (or a grill pan on the stove over medium-high).

Step 4

Coat the tuna steaks with the blackening seasoning on all sides, then spray the top and bottom with cooking spray.

Step 5

Add the steaks to the hot grill and cook for 1-2 minutes per side, or until black grill marks have formed but the inside is still rare. Serve hot topped with mango avocado salsa.