- Preheat oven to 450 degrees F. 
- In a large cast iron skillet, add potatoes, olive oil and half of the dill  
- Season with salt and pepper 
- Roast 15-20 minutes, or until potatoes are almost tender. 
- Blot halibut filets with a paper towel to remove any moisture and cover with lemon juice. 
- Allow halibut to soak in lemon juice while potatoes are cooking.  
- Remove pan from the oven and top with halibut filets, olives and stir in garlic. 
- Drizzle halibut with a little olive oil and top with remaining dill, lemon zest, and lemon juice. 
-   Bake for 10 minutes, or until fish flakes with a fork.   
-   Serve immediately.  Garnish with extra dill, if desired.