Pork tenderloin is one of the leanest cuts of meat you can buy, so it goes dry if it is overcooked. Sear it hard, roast it briefly, then let it rest. Take it out as soon as it is cooked through, and the slices stay juicy.

Pork tenderloin is one of the leanest meats there is, with only about 3 to 4g of fat per 100g raw, less than many cuts of chicken with the skin on. A serving here has about 27g of protein for around 360 calories, potatoes included.
It still counts as red meat. In UK guidance, pork is red meat alongside beef and lamb. The NHS advises anyone eating more than 90g of red and processed meat a day, cooked weight, to cut down to 70g. Here 400g of raw tenderloin shared between four comes to roughly 70g cooked each, so it sits within that advice.
Why it goes dry, and how to stop it. With so little fat, tenderloin has nothing to protect it once it is cooked. Searing first, a short roast and a 5-minute rest let you cook it through safely while keeping it moist. Check it a few minutes early rather than late.
Red cabbage brings fibre, vitamin C and the purple pigments called anthocyanins. Together with the apples and potatoes, a serving has about 6.5g of fibre. Pork is also a good source of thiamin (vitamin B1) and zinc.
For women around menopause, a dinner with lean protein and plenty of vegetables supports both muscle and heart health: see menopause and heart health. For another lean meat traybake, try the turkey, sweet potato and tart cherry traybake.