Fennel Sausage with Romano Beans, Herby Green Sauce, Walnuts & Roasted Purple Potatoes

Juicy fennel sausage anchors a plate of deeply browned purple potatoes and tender roasted Romano beans with sweet spring onion. A rough-chopped, lemony herb sauce cuts through the richness, while toasted walnuts give the vegetables a little crunch. It’s a generous summer supper with very little fuss at the stove.

By Jonathan Katzman · Cooked and photographed · Recipe updated

Serves: 4 servings

Tags: gluten-free

Fennel Sausage with Romano Beans, Herby Green Sauce, Walnuts & Roasted Purple Potatoes

Browned Fennel Sausages

Gentle covered cooking heats the sausages through without splitting their casings; an uncovered finish develops a savory brown exterior.

Ingredients

  • 4 large links fresh pork fennel sausages, preferably Fatted Calf, about 1½–2 pounds total; confirmed gluten-free
  • 2 teaspoons ghee
  • ⅓ cup water

Instructions

  1. Pat the sausages dry without piercing their casings.
  2. Heat the ghee in a large skillet over medium heat. Add the sausages and brown gently for 5–7 minutes, turning to color several sides.
  3. Carefully add the water, cover, and reduce the heat to medium-low. Cook for 8–12 minutes, turning once, until nearly cooked through.
  4. Uncover and let the water evaporate. Continue cooking, turning as needed, until the casings are golden brown and the centers reach 160°F on an instant-read thermometer inserted through an end. Large links may need several additional minutes.
  5. Rest for 3–5 minutes before serving whole.

Notes

  • Keep the heat moderate: aggressive browning can split the casings before the centers are cooked.

Roasted Romano Beans and Spring Onion with Walnuts

Roasting concentrates the beans' sweetness and softens the onion into tender petals. Walnuts added at the end stay crisp against the dressed vegetables.

Ingredients

  • 1¼ pounds Romano beans, stem ends trimmed
  • 3 medium spring onions, bulbs cut into ½-inch wedges and tender greens cut into 2-inch lengths
  • 2 tablespoons extra-virgin olive oil
  • ½ teaspoon kosher salt, plus more to taste
  • ¼ teaspoon freshly ground black pepper
  • ½ cup walnut halves and pieces

Instructions

  1. Heat the oven to 425°F. Spread the walnuts on a small baking sheet and toast for 5–7 minutes, checking early, until fragrant and lightly golden. Cool and roughly chop.
  2. Leave small Romano beans whole; cut very long ones crosswise into 3–4-inch lengths. Toss the beans and spring onion bulbs with the olive oil, salt, and pepper on a large rimmed baking sheet.
  3. Spread into a single layer and roast for 12 minutes. Turn the vegetables, add the tender onion greens, and roast for another 8–13 minutes, until the beans are tender with blistered edges and the onion wedges are soft.
  4. Transfer to a serving dish and spoon over about half the herby green sauce while the vegetables are warm. Scatter with walnuts just before serving, offering the remaining sauce alongside.

Notes

  • Use a second tray if necessary; crowding prevents the beans from browning.
  • If the beans are thick and still firm after browning, add 1–2 tablespoons water, cover the tray with foil, and return to the oven for 3–5 minutes.

Herby Green Sauce

Hand-chopped herbs give the sauce texture, while lemon and capers provide enough acidity and salinity to balance both the sausage and the roasted vegetables.

Ingredients

  • 1 cup loosely packed flat-leaf parsley leaves and tender stems
  • ¼ cup loosely packed mint leaves
  • 1 tablespoon capers, drained and finely chopped
  • 1 small clove garlic, finely grated
  • 1 teaspoon finely grated lemon zest
  • 2 tablespoons fresh lemon juice
  • ⅓ cup extra-virgin olive oil
  • to taste kosher salt and freshly ground black pepper

Instructions

  1. Finely chop the parsley and mint by hand, leaving a little texture rather than reducing them to a paste.
  2. Combine the capers, garlic, lemon zest, and lemon juice in a bowl. Let stand for 5 minutes to soften the garlic's sharpness.
  3. Stir in the herbs and olive oil. Season with salt and pepper, tasting before adding much salt because the capers are already salty.
  4. Adjust with a little more lemon juice if needed. The sauce should be bright, spoonable, and loose enough to settle between the beans.

Notes

  • For a looser sauce, add olive oil a teaspoon at a time. Stir again immediately before serving.

Roasted Purple Potato Coins

Thick coins provide broad surfaces for browning while keeping the centers creamy. A hot metal tray and enough space are more useful than frequent turning.

Ingredients

  • 1½ pounds small purple potatoes, scrubbed and cut into ¾-inch-thick coins; small potatoes halved
  • 2 tablespoons extra-virgin olive oil
  • ¾ teaspoon kosher salt
  • ¼ teaspoon freshly ground black pepper

Instructions

  1. Heat the oven to 425°F with a heavy rimmed baking sheet inside.
  2. Dry the cut potatoes thoroughly and toss with the olive oil, salt, and pepper.
  3. Carefully arrange the potatoes on the hot sheet with a broad cut face down, leaving space between pieces.
  4. Roast undisturbed for 22–25 minutes, until the undersides are deeply browned and release easily with a thin spatula.
  5. Turn and roast for another 12–20 minutes, until browned on the second side and completely tender when pierced. Taste and add a little salt if needed.

Notes

  • Purple potato flesh can vary from violet to mottled cream; judge doneness by tenderness rather than color.

Overall Timing / Workflow

The potatoes get a head start, then the vegetables roast while the sausages cook. The sauce and walnuts can be prepared during the hands-off oven time.

Instructions

  1. 0:00 — Heat the oven to 425°F with the potato tray inside. Wash and cut the potatoes.
  2. 0:10 — Put the potatoes in the oven. Toast the walnuts on a separate small tray, then set them aside to cool.
  3. 0:15 — Trim the beans and cut the spring onions. Chop and mix the green sauce.
  4. 0:25 — Put the beans and onion bulbs in the oven on a separate tray. Start cooking the sausages on the stove.
  5. 0:35 — Turn the potatoes and beans, adding the onion greens to the bean tray. Rotate the trays between racks if browning unevenly.
  6. 0:45–0:55 — Check the vegetables for tenderness and the sausages for a 160°F internal temperature. Rest the sausages, dress the beans, and add the walnuts just before plating.

Notes

  • Allow about 55–65 minutes total, including oven preheating. Potatoes can wait in a warm oven briefly if the sausages need more time.

Plating

Keeping the potatoes separate from the dressed vegetables preserves their browned surfaces, while the green sauce stays concentrated where it best complements the beans and sausage.

Instructions

  1. Place one whole sausage along one side of each warm plate.
  2. Arrange a compact pile of purple potatoes beside it, with browned faces visible.
  3. Spoon the beans and spring onion into the remaining space, keeping the onion petals and flat beans visible.
  4. Distribute the toasted walnuts over the vegetables and add a little more herb sauce. Serve the rest of the sauce at the table.

Leftover Path

Separate storage lets the potatoes regain their crisp edges without overcooking the sausage or dulling the fresh herb sauce.

Instructions

  1. Refrigerate the sausages, potatoes, and vegetables in separate airtight containers within 2 hours. Keep unused herb sauce and walnuts separate. Use cooked leftovers within 3–4 days and the sauce within 2 days.
  2. Reheat potatoes in a 425°F oven for 10–15 minutes. Reheat sausages in a covered skillet with a splash of water, then uncover briefly; heat leftovers to 165°F.
  3. Warm the beans gently or serve them at room temperature after taking them from the refrigerator shortly before the meal. Add reserved sauce and walnuts after reheating.
  4. For another meal, slice the reheated sausage over the warm potatoes and beans, finishing with the remaining green sauce.