Khao tom (ข้าวต้ม) is a Thai rice porridge made by simmering long-grain jasmine rice in a light chicken broth until the grains partially dissolve into a thick, creamy-textured porridge. It is a staple Thai breakfast dish and comfort food found on Thai restaurant menus across Australia. The recipe combines rice, light chicken stock, ginger, garlic, and fish sauce, typically garnished with poached or minced chicken, fried shallots, fried garlic, spring onion, coriander, and white pepper. The stain profile is largely about starch and consistency rather than colour: khao tom is pale ivory to white (the dissolved rice starch gives it a creamy colour but essentially no colour pigment), making this one of the few thick soups with almost no colour treatment needed. The dominant treatment challenge is the very high dissolved rice starch — even higher than split pea soup on a per-volume basis because the rice grains are partially liquefied, creating a high-density starch suspension. Enzyme amylase for 25 minutes minimum. Fish sauce adds a fermented fish aroma that warrants one overnight baking soda application. Scoop the porridge before blotting.
Khao tom cleaning steps
- Scoop the bulk of the thick rice porridge using a spoon — the consistency is thick enough that a large proportion can be physically removed before blotting. Do not press.
- Blot the remaining liquid.
- Apply cornflour if the soup contained a significant amount of fried garnish (fried shallots, fried garlic) or if poached chicken or meatballs were present. If it was plain broth-and-rice khao tom with no oil-fried garnish and no protein pieces, the cornflour round can be skipped — the fat load is very low.
- Apply cold water and blot.
- Apply dish soap solution and blot.
- Apply enzyme cleaner for 25 minutes — the dissolved rice starch concentration in khao tom is very high. This is the most important treatment step. Ensure full surface coverage and do not rush the dwell time.
- Rinse with cold water and blot dry.
- Colour assessment: in virtually all cases, no hydrogen peroxide is needed — khao tom leaves a pale ivory stain that will not be visible once dry.
- Apply baking soda overnight for the fish sauce fermented fish aroma. Vacuum the following day. One overnight application is typically sufficient.
Dissolved rice starch — why khao tom is stickier than plain rice spills
Whole cooked rice grains spilled on carpet are relatively easy to pick up and remove because the starch is mostly contained within the intact grain. Khao tom rice has been cooked until the grain structure breaks down — the starch has leached out of the grain into the surrounding liquid, creating a high-concentration starch suspension. When this porridge penetrates carpet fibres, it deposits dissolved starch (gelatinised amylose and amylopectin) on every fibre surface in the penetrated zone. As the porridge dries, this gelatinised starch forms a stiff, slightly glossy coating that makes the carpet feel crispy and stiff in the spill area. This stiff starch residue also traps subsequent dirt — the area darkens noticeably with foot traffic if the starch is not fully broken down by enzyme treatment. The enzyme amylase step at 25 minutes dwell is the difference between a clean result and a traffic-attracting stiff spot.
Rice starch residue or fish sauce odour from khao tom persisting in carpet?
Dense dissolved rice starch that has penetrated carpet pile and backing may need professional hot-water extraction for complete resolution.
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Frequently asked
The khao tom had a raw egg stirred into it at the table — the egg was cracked into the hot porridge and lightly mixed (leaving streaks of egg rather than fully cooked egg). The semi-raw egg may have landed on the carpet. Does the raw egg component change the treatment significantly?
A raw or lightly cooked egg stirred into hot khao tom coagulates partially from the heat of the porridge but remains semi-liquid. Semi-cooked egg white (albumen) is more water-soluble than fully cooked egg white — it blots up more easily than hard-cooked egg. However, egg albumen that reaches full coagulation temperature (above 70°C) sets permanently and must be treated with cold water to prevent further setting. Use cold water only in all rinse steps. The enzyme protease step addresses the partially cooked egg albumin; the same dwell time (25 minutes) handles both the rice starch and the egg protein simultaneously. The egg yolk adds a small additional fat contribution from the lecithin and yolk lipids — if the yolk was raw, add one cornflour round. Fully cooked hard egg does not occur in a table-stirred khao tom egg, so a hard-set egg treatment is not needed.
The khao tom was the version with pork mince and century egg (preserved egg) — a common khao tom variant. Century egg has a very dark grey-black yolk and a dark translucent gel white. Does the century egg pigment stain carpet?
Century egg (pidan — preserved egg with alkaline treatment) has a dark charcoal-grey yolk and a dark green-grey to brown translucent gel white, both coloured by iron sulphide and other sulphur-iron compounds formed during the alkaline preservation process. The iron sulphide pigment in century egg is dark and can leave a dark grey contact stain at century egg contact points. One hydrogen peroxide round targeted to the century egg contact spots addresses the iron sulphide colour (peroxide oxidises iron sulphide). The century egg also has a strong sulphur-ammonia smell from the alkaline preservation process — add a second overnight baking soda application (one for the fish sauce, one for the century egg sulphur-ammonia compounds). The pork mince adds meat fat (one cornflour round).
The khao tom was made with a large amount of ginger — thin julienned strips of raw ginger were scattered through the porridge and some landed on the carpet. Does fresh ginger stain carpet?
Fresh ginger contains gingerol (the pungent compound responsible for ginger heat) and curcumin-related yellow pigment compounds (ginger has a faint yellow colour from its phenolic compounds, distinct from but related to turmeric curcumin — both are in the gingerol-curcuminoid family). Julienned ginger strips on carpet at typical khao tom garnish concentrations deposit a very faint yellow contact stain at the ginger contact points. This is usually too faint to require a peroxide treatment step. Pick up the ginger strips before blotting (they are firm and easy to remove). If a faint yellow-gold tinge is visible at the ginger contact points after the main treatment dries, one targeted hydrogen peroxide round to those spots addresses the ginger pigment compounds.