In a medium bowl mix together olive oil, lemon juice and Jalapeno Dust. Add tilapia fillets to mixture and coat well. Marinate for 1-2 hours.
Prepare four wood planks by soaking for one hour. Drizzle tops of planks with olive oil and place a piece of fish on each plank. Grill in a 250 degree grill or oven for 20 minutes. (Will flake with fork when done.)