Mushroom Oat Risotto with Peas

What it is

Rolled oats cooked like a risotto, with browned mushrooms, peas, cheese and a squeeze of lemon. Oats usually live in the breakfast bowl; tonight they work the dinner shift.

Why you should eat it

Real protein and a lot of fiber, most of it from the oats, with the peas and mushrooms adding more. The cheese is rich in lysine, the amino acid oats have the least of, so together they make a better protein team. It also brings most of the salt, so taste before you add any.

Tips

• Use old-fashioned rolled oats, not quick or instant. They keep their bite.
• Let the mushrooms brown untouched for a few minutes before you stir.
• Too thick at the end? A splash of hot water. Too loose? The rest under the lid tightens it.

Substitutions

• Rolled oats: Steel-cut oats, same weight. Chewier and much slower: add more liquid and cook until tender.
• Vegetable stock: Low-salt stock, or water. Less salt.
• Make it vegan: Skip the butter, use olive oil, and a plant-based hard cheese. Less protein, and the numbers in the box won't match.

Storage

Fridge within 2 hours, up to 4 days; freezer up to 4 months. Reheat until steaming with a splash of water, because the oats keep drinking.

While it rests: the science

Picture an old wooden barrel. Pour in water and it only fills up to the shortest plank. Protein works the same way: your body builds with amino acids, and whichever one runs shortest sets the limit.

For oats, the short plank is lysine, and oat protein sits right around what an adult needs. The cheese carries about twice as much, so a small handful lifts the whole pot well clear of the line. Oats bring the body, cheese tops up the gap.

Oats and muscle: a team sport

Researchers at Maastricht University reviewed the studies on plant against animal protein for building muscle. Their tip: mix a plant protein with an animal one, like dairy, and most of the gap closes. Oats plus cheese is exactly that kind of mix, though nobody tested this dish, and the review was supported by PepsiCo's Gatorade institute.

Why the big flakes

Across 71 blood sugar tests of oat foods, large flakes scored 53 on the glycaemic index, quick oats 71 and instant 75. The more processed the flake, the bigger the rise, which is why this recipe uses large flakes. Every test was oats eaten on their own, and one of the two authors works for PepsiCo, which owns Quaker.

Oats and your cholesterol

Pooling 74 trials, researchers found that oats eaten daily for about a month nudged LDL, the cholesterol doctors watch, down a little, mostly in people whose cholesterol was already high. One risotto night won't do it, the trials varied a lot, and a supplement company paid for the review. Managing your cholesterol? Talk to your doctor.