Pat sablefish fillet dry with paper towels and season with salt and white pepper on both sides
Heat olive oil in a large braising pan or deep skillet over medium-high heat
Sear sablefish fillet on both sides for 2-3 minutes until golden, then transfer to a plate
In the same pan, sauté onion over medium heat until translucent
Add minced garlic and cook for 1 minute until fragrant
Add diced tomatoes and stir-fry for 2 minutes to break them down slightly
Pour in white wine and fish stock, bring to a gentle simmer
Add green olives, thyme, and rosemary to the sauce
Gently place seared sablefish fillet back into the pan, nestling it into the sauce
Reduce heat to medium-low and braise uncovered for 15-18 minutes until fish is cooked through and flakes easily
Taste and adjust seasoning with salt and pepper if needed
Garnish with fresh chopped parsley and serve immediately with the tomato-olive sauce
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