Here is a reliable, crispy-on-the-outside, fluffy-on-the-inside way to make roast potatoes, plus a few “forum‑style” tips people swear by.

Core method (quick version)

  1. Choose potatoes
    • Use a floury variety (like Maris Piper, King Edward, russet, or any “baking potato”).
 * Waxy potatoes work, but they stay firmer and less fluffy.
  1. Prep and parboil
    • Peel (optional, but classic) and cut into chunky, even pieces (about golf‑ball size).
 * Put in a pan of cold, salted water just covering the potatoes.

 * Bring to a boil, then simmer until the edges are soft and the outside is just starting to break up: usually 8–12 minutes depending on size.
  1. Steam‑dry and rough them up
    • Drain in a colander and let them steam‑dry for a couple of minutes so surface moisture evaporates.
 * Shake the colander gently to rough up the edges; this gives more crisp surface.
  1. Preheat the fat in the oven
    • Heat the oven to about 200–220°C (400–425°F), a bit lower if fan.
 * Put a roasting tin with a good layer of oil, duck/goose fat, or beef dripping into the oven so the fat gets really hot and shimmering.
  1. Coat and roast
    • Carefully tip the roughened potatoes into the hot fat (they should sizzle) and turn them so they’re well coated and not crowded.
 * Season well with salt and pepper; add garlic cloves and herbs (rosemary, thyme) if you like.

 * Roast for around 45–60 minutes, turning once or twice, until deep golden and crisp on all sides.
  1. Serve immediately
    • Sprinkle with a little extra salt and some chopped parsley or rosemary if you want them to look “Sunday roast” perfect.

Mini sections

Key tips people repeat

  • Don’t skip parboiling : many cooks in recipes and forums say “pre‑boil until nearly mash, then roast” for the fluffiest inside.
  • Rough edges = crunch : shaking in the colander and even dusting lightly with a bit of flour or semolina gives a super‑crisp crust.
  • Hot fat, hot tray : adding potatoes to properly preheated fat stops them soaking oil and helps instant crusting.
  • Space them out : crowding the tray makes them steam instead of crisp; forum posters often say “give each potato space”.

Simple herb & garlic variation

  • Toss parboiled potatoes with olive oil, minced or lightly smashed garlic, chopped rosemary, parsley, and thyme.
  • Spread in a single layer on a metal tray and roast at about 220°C / 425°F for 35–40 minutes until golden and fork‑tender.

Common mistakes (and fixes)

  • Too pale, not crispy
    • Oven too cool, or potatoes too crowded; raise temp slightly and split across two trays.
  • Bland potatoes
    • Not enough salt or seasoning; people on forums often call out “zero seasoning” when roasties look plain.
  • Smooth, shiny surface
    • Didn’t rough them up after boiling; shake them more next time so the surface goes craggier.

Quick forum‑style tweak ideas

  • Light dusting of cornflour or semolina before roasting for extra crunch.
  • Whole, lightly smashed garlic cloves roasted with the potatoes so you get soft, sweet garlic inside and infused fat outside.

“Pre boil until nearly mash… then roast. That’s what’s missing.” – a typical roast‑potato comment that sums up the magic step.

TL;DR:
Parboil cut potatoes in salted water until the edges just soften, rough them up in a colander, then roast them in very hot fat at about 200–220°C until deep golden, turning once or twice and seasoning well.

Information gathered from public forums or data available on the internet and portrayed here.