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Turkey, Sweet Potato and Tart Cherry Traybake

One tray, forty-five minutes, and a dinner built for the evening rather than the gym. The cherries are not a garnish: they are the reason this is on the list.

Dinner

45

Serves 2

Turkey breast traybake with sweet potato and dark cherries

Ingredients

  • 2 turkey breast steaks, about 175g/6oz each
  • 400g/14oz sweet potato, skin on, cut into 3cm/1¼in chunks
  • 120g/4oz cherries, fresh or frozen, stoned (sour varieties if you can get them)
  • 1 red onion, in wedges
  • 2 cloves of garlic, whole and unpeeled
  • 2 tbsp extra-virgin olive oil
  • 1 tsp balsamic vinegar
  • A sprig of rosemary
  • A large handful of spinach
  • Salt and plenty of black pepper

Method

  1. Heat the oven to 220C (200C fan, 425F).
  2. Toss the sweet potato, onion, whole garlic cloves and rosemary with 1 tbsp of the oil, salt and pepper. Spread them out with space between them: crowded, they steam and go soft rather than caramelising. Roast for 15 minutes.
  3. Rub the turkey with the remaining oil and season it well.
  4. Push the vegetables aside, lay the turkey in the tray and scatter the cherries around it. Trickle over the balsamic.
  5. Roast for another 12 to 15 minutes, until the turkey is steaming hot, with no pink meat, clear juices and 75C/167F in the thickest part on a probe thermometer. Turkey steaks are thin, so start checking at 10 minutes to avoid overcooking them.
  6. Rest the turkey on a board for five minutes. Stir the spinach through the hot tray so it wilts in the cherry juices, then slice the turkey and serve it on top.

Why it works

Almost everything written about food and sleep is about what to avoid. This is a dinner built around what to include.

Turkey is high in tryptophan, the amino acid the body converts to serotonin and then to melatonin. Tryptophan on its own, though, competes with other amino acids for transport into the brain and usually loses. Carbohydrate is what changes that: it triggers an insulin response that clears the competing amino acids from the blood, leaving tryptophan a clearer run. That is why the sweet potato is not optional here: turkey without the carbohydrate is just a lean protein.

Cherries are one of the few foods containing measurable melatonin, and sour varieties carry considerably more than sweet ones. Small trials of tart cherry juice have reported modest improvements in sleep duration; the effect is real but not large, and it is not a substitute for a dark room and a consistent bedtime.

Sleep is where this matters most for hormones. The great majority of daily testosterone release happens during sleep, and short or fragmented sleep lowers next-day levels in healthy men within a week. For women through perimenopause, the sleep disruption is often the symptom that makes every other symptom worse.

Eat it two to three hours before bed. Later than that and digestion works against you.

More: sleep apnoea and testosterone · menopause, sleep and hormones.