Source: HowToCook (a programmer's guide)
Milk oatmeal is a cereals|cereal dish built on the principle of hydrating oats twice: first in water to soften the grain, then finishing in milk to add richness and prevent the starch from absorbing all the liquid and turning gluey. The two-liquid approach stops you ending up with a dense, waterlogged porridge.
Bring 200 ml water to a rolling boil. If using tap water, boil it first — chlorine will flatten the flavour. Add 40 g rolled oatmeal and stir immediately to prevent lumps. Maintain a gentle simmer for 2 minutes. The oats will swell noticeably and the water will thicken as the starch releases; this is the emulsification point where you've hydrated the grain enough that it can hold milk without breaking down further. Don't overcook — the oats should retain slight resistance when you bite them, not collapse into paste.
Pour the cooked oatmeal into a bowl and add 280 ml cold milk whilst stirring. The temperature drop halts the cooking process and the milk's fat and breakfast|dairy proteins coat the oat particles, which prevents them fusing together. Add the 3 g of pepper salt now; the salt grounds the bland starch flavour and the pepper cuts through the sweetness of the milk. Taste and adjust — you want the salt present but not obvious.
For speed, use quick-cook oats instead: pour 280 ml milk directly into a bowl with 40 g quick-cook oatmeal and stir to combine. Microwave on medium power for 4 minutes, stirring halfway through. The shorter grain pieces hydrate faster in milk alone, and the microwave's gentler, more even heat prevents scorching at the bowl's edges. Season as above.
For a protein addition, fry an egg whilst the oatmeal cooks. Heat a shallow pan with a thin film of oil until the surface ripples. Crack the egg in and cook the underside until the white sets (roughly 20 seconds), then flip and cook the yolk side for a further 20 seconds if you want a runny centre, longer if you prefer it firm. Season with the 3 g pepper salt and slide the egg onto the finished oatmeal. The yolk's fat enriches the milk and oat combination, whilst the cooked white provides textural contrast.
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