Roasted Black Cod with Spring Onion, Green Garlic, Spicy Rhubarb Confit and Coriander Parsnips

Roasted Black Cod with Spring Onion and Green Garlic

Black cod stays succulent during roasting, while finely sliced spring alliums soften in the fish juices and olive oil. A little lemon balances the rich flesh without competing with the rhubarb.

Ingredients

• 4 portions black cod (sablefish), 6–7 oz each, thawed if frozen
• 3 spring onions, bulbs and tender greens thinly sliced
• 2 stalks green garlic, tough outer leaves removed, tender parts thinly sliced
• 3 tbsp extra-virgin olive oil
• 3/4 tsp kosher salt, plus more to taste
• 1/4 tsp freshly ground black pepper
• 2 tsp fresh lemon juice

Instructions

1. Heat the oven to 400°F. Pat the fish dry, check for pin bones and season with salt and pepper.
2. Toss the spring onions and green garlic with the olive oil and a small pinch of salt. Spread half in a snug baking dish, set the fish on top skin-side down if skin-on, and scatter the remaining alliums over it.
3. Roast for 12–18 minutes, depending on thickness, until the flesh separates into moist flakes and the thickest part reaches 145°F. Begin checking at 10 minutes for thin portions.
4. Spoon the aromatic oil and cooking juices over the fish, add the lemon juice and serve promptly.

Notes

• Thaw IQF fish overnight in the refrigerator. Remove it from vacuum packaging before thawing unless the package specifically directs otherwise.
• Use only tender green garlic leaves; fibrous dark tops will not soften during the short roast.

Spicy Rhubarb Confit

Gentle cooking in olive oil softens rhubarb into a savory, spoonable condiment. A restrained amount of honey rounds its acidity, while chile and ginger give the rich fish a sharp counterpoint.

Ingredients

• 12 oz rhubarb stalks, leaves discarded, cut into 1 1/2-inch lengths
• 1/3 cup extra-virgin olive oil
• 1 tbsp fresh ginger, finely julienned
• 1/2 tsp red chile flakes
• 1 tbsp honey
• 1 tsp apple cider vinegar, plus more to taste
• 1/2 tsp kosher salt, plus more to taste

Instructions

1. Combine the olive oil, ginger and chile flakes in a small, wide saucepan. Warm over low heat for 2 minutes, until fragrant but not browned.
2. Add the rhubarb, honey and salt, turning gently to coat. Arrange in a shallow layer, cover and cook over very low heat for 10 minutes.
3. Uncover and cook for another 3–8 minutes, gently shaking the pan rather than stirring, until the rhubarb is tender and starting to slump but still has some recognizable pieces. Keep the oil at a gentle shimmer, not a fry.
4. Stir the vinegar into the surrounding juices. Taste a cooled spoonful and adjust salt, honey or vinegar sparingly; the result should be distinctly tart, lightly sweet and spicy. Serve warm or at room temperature.

Notes

• If the pan becomes dry before the stalks soften, add 1 tablespoon water and cover briefly.
• Rhubarb varies considerably in acidity; add extra honey a teaspoon at a time rather than turning the confit into a sweet compote.

Roasted Parsnips with Onion and Coriander

Long parsnip batons develop browned edges while retaining creamy centers. Onion petals become sweet and silky, and crushed coriander adds a citrusy warmth that connects the roots to the tart rhubarb.

Ingredients

• 1 1/2 lb parsnips, peeled
• 2 medium red or yellow onions, cut into 1/2-inch wedges
• 3 tbsp extra-virgin olive oil
• 2 tsp coriander seeds, coarsely crushed
• 3/4 tsp kosher salt, plus more to taste
• 1/4 tsp freshly ground black pepper
• 2 tsp fresh lemon juice
• 1/4 cup cilantro leaves and tender stems, optional

Instructions

1. Heat the oven to 400°F. Cut the parsnips into batons approximately 3–4 inches long and 1/2 inch thick. Remove any tough, woody cores from large roots.
2. Toss the parsnips and onion wedges with olive oil, crushed coriander, salt and pepper. Spread on a large rimmed baking sheet in a single layer, keeping some onion wedges intact.
3. Roast for 35–45 minutes, turning after 20 minutes, until the parsnips are tender and browned on several surfaces and the onion petals are soft with dark edges. Remove any onion pieces that finish early.
4. Toss gently with lemon juice and adjust the salt. Scatter with cilantro, if using, just before serving.

Notes

• Use two baking sheets if necessary; crowded roots steam rather than brown.

Overall Timing / Workflow

The parsnips take the longest and can roast at the same temperature as the fish. The rhubarb holds well, leaving only the delicate cod to finish at the last minute.

Instructions

1. If using frozen cod, thaw it in the refrigerator the day before.
2. 0:00 — Heat the oven to 400°F. Cut and season the parsnips and onions.
3. 0:15 — Put the parsnips in the oven. Prepare and start the rhubarb confit on the stovetop.
4. 0:30 — Prepare the fish, spring onions and green garlic. Finish the confit and set it aside.
5. 0:35 — Turn the parsnips. Put the cod on a separate oven rack, allowing air to circulate around both dishes.
6. 0:47–0:55 — Check the fish for doneness and remove it when ready. Finish the parsnips with lemon and cilantro, then plate with the warm rhubarb.

Notes

• Allow roughly 55–65 minutes total, depending on prep speed and fish thickness. If the vegetables need longer, finish them before roasting the fish and keep them warm.

Plating

Keeping the rhubarb beside the cod lets each bite pick up as much tartness as desired. A little aromatic cooking oil ties the fish and browned vegetables together.

Instructions

1. Divide the parsnips and onion petals among four warm plates, leaving space beside them for the fish.
2. Lift a portion of cod onto each plate and spoon its roasted spring onion, green garlic and a little cooking juice over the top.
3. Add a spoonful of rhubarb confit alongside, including a little of its spicy oil. Finish with any remaining optional cilantro and serve immediately.

Leftover Path

Storing the components separately protects the fish from the acidic confit and allows the vegetables to be reheated without overcooking the cod.

Instructions

1. Refrigerate the fish, vegetables and confit in separate covered containers within 2 hours. Use the fish within 2 days and the vegetables and confit within 3–4 days.
2. Reheat the parsnips and onions in a 400°F oven until hot and lightly crisp at the edges.
3. For the gentlest fish leftovers, flake the cod cold over the warmed vegetables and spoon the rhubarb alongside. If reheating the fish, cover with its cooking juices and warm gently until it reaches 165°F.

Notes

• The rhubarb is a refrigerated condiment, not a shelf-stable preserve.