Tenderloin of Beef with Elderberry Umeboshi

MAKE THE ELDERBERRY UMEBOSHI (FRUIT LEATHER):
Place the elderberries, kosher salt, granulated sugar, rice wine vinegar, mirin, and water in a small saucepan over medium heat. Cook, stirring frequently, for 12–15 minutes until the berries have broken down into a thick, jammy mass. Taste — it should be simultaneously salty, tart, and slightly sweet, with the berries' natural astringency present but not overwhelming. Pass through a fine-mesh sieve, pressing firmly to extract all pulp; discard the seeds. Spread the strained purée very thinly (about 2–3 mm) onto a silicone baking mat or parchment-lined baking sheet. Dry in a 170°F / 75°C oven for 1.5–2 hours, until the surface is dry to the touch but still pliable — like a supple fruit leather, not brittle. Remove and cool completely. Cut into thin strips or tear into rustic pieces to drape over the beef at service. Store refrigerated between parchment sheets for up to 3 days.

MAKE THE ELDERBERRY–RED CABBAGE PURÉE:
Sweat the sliced shallot in a small splash of olive oil over medium heat until soft, about 4 minutes. Add the red cabbage and cook for a further 5 minutes, stirring, until it begins to soften. Add the elderberries and beef stock. Bring to a gentle simmer and cook, partially covered, for 20–25 minutes until the cabbage is very tender and the elderberries have completely broken down. Transfer to a blender and blend on high until completely smooth — 2–3 full minutes. Pass through a fine-mesh sieve for a silky result. Return to a small saucepan, season with salt, and finish by whisking in the cold butter and a squeeze of lemon juice (the lemon also brightens the deep purple colour). Keep warm over the lowest heat, or reheat gently at service.

MAKE THE PICKLED ELDERBERRY SAUCE:
Warm the olive oil in a small saucepan over medium heat. Add the minced shallots and sweat gently for 4–5 minutes until translucent. Add the elderberries, red wine vinegar, and sugar. Cook for 3–4 minutes, stirring, until the elderberries release their juice and the mixture reduces by about half. Add the beef stock and simmer for 8–10 minutes until the sauce has a light coating consistency. Season with salt and pepper. Just before serving, remove from the heat and mount with the cold cubed butter, swirling the pan or whisking gently until fully incorporated and the sauce is glossy. Strain through a fine sieve for a cleaner finish, or leave the berries in for a more rustic presentation, as Massimo served it.

PREPARE THE SMOKED KOHLRABI:
Place a small handful of apple or cherry wood chips in the base of a lidded wok or deep pan. Set over high heat until the chips begin to smoke. Peel the kohlrabi and cut into uniform small cubes (about ¾ inch / 2 cm). Place on a wire rack inside the wok, cover tightly, and smoke for 4–5 minutes. Remove and cool. If a smoking setup is not available, toss the kohlrabi cubes with olive oil and smoked paprika instead. Either way, finish by seasoning with olive oil and flaky salt. The kohlrabi should retain some bite — it is a condiment element providing earthy, savoury contrast, not a soft side. If you prefer it softer, blanch briefly in salted boiling water after smoking.

COOK THE BEEF TENDERLOIN (OLIVE OIL IMMERSION METHOD):
Remove the trimmed tenderloin from the refrigerator 45 minutes before cooking to come fully to room temperature. Season generously on all sides with salt and pepper. In a heavy-based deep saucepan or Dutch oven, pour in enough olive oil to fully submerge the tenderloin — typically 2–3 cups depending on the diameter of your pan. Add the garlic cloves, thyme sprigs, and rosemary sprig. Heat the oil over medium-low heat to 160–165°F / 71–74°C — just below a gentle shimmer; do not let it simmer or bubble. Carefully lower the seasoned tenderloin into the oil. Maintain the temperature at 160–165°F for 18–22 minutes for medium-rare at the centre (internal temperature 125–128°F / 52–53°C), using a digital thermometer throughout. Remove the tenderloin from the olive oil and immediately transfer it to a smaller pan filled with warm clarified butter (at around 130°F / 55°C). Rest the beef in the clarified butter for 8–10 minutes — the osmosis rest: as the beef relaxes and reabsorbs liquid, the clarified butter enters the meat. Remove, pat dry very gently, and apply flaky finishing salt. Slice to order.

PLATE THE DISH:
Spoon a generous pool of the elderberry–red cabbage purée onto one side of a warm plate, sweeping it with the back of a spoon. Arrange 2–3 thick slices of the tenderloin off-centre on the purée. Lay a strip or torn piece of the elderberry umeboshi leather over the top of the beef — this is the signature visual of the dish. Spoon the pickled elderberry sauce around the beef in a loose arc. Place a small, neat cluster of the smoked kohlrabi alongside. Finish with a pinch of flaky salt directly on the beef surface and serve immediately.