Japanese · Pork
Japanese Katsudon
About this recipe
Japanese home cooking centres on dashi — the kombu-and-katsuobushi broth that underwrites soups, simmered dishes, and seasoning — alongside a respect for ingredient quality that means less manipulation, not more. Every dish has a few elements, each doing one job well.
As a pork dish, Japanese Katsudon works through the same fast-and-slow divide as other red meats — quick-seared chops vs slow-cooked shoulder — with the cut dictating the right cooking time and temperature.
Set your servings in the scaler above and every line of the recipe rewrites itself with smart fractions and unit promotion. Open Cook Mode to step through it hands-free with timers running.
Recipe data is sourced from TheMealDB's open community database; ScaleRecipe handles the curation, the scaling math, the editorial commentary, and the conversion utilities woven into each page.
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Method
- STEP 1
- Heat the oil in a pan, fry the sliced onion until golden brown, then add the tonkatsu (see recipe here), placing it in the middle of the pan. Mix the dashi, soy, mirin and sugar together and tip three-quarters of the mixture around the tonkatsu. Sizzle for a couple of mins so the sauce thickens a little and the tonkatsu reheats.
- STEP 2
- Tip the beaten eggs around the tonkatsu and cook for 2-3 mins until the egg is cooked through but still a little runny. Divide the rice between two bowls, then top each with half the egg and tonkatsu mix, sprinkle over the chives and serve immediately, drizzling with a little more soy if you want an extra umami kick.
Cooking notes
When scaling protein-led dishes, weigh the meat rather than counting pieces, and remember that the pan size limits how much you can sear at once.
For volume-to-weight conversions of any ingredient — flour, sugar, butter, salts — use the ingredient converter. To translate the recipe's oven temperature between °C, °F and gas mark, see the temperature converter.
When you scale this recipe up or down, remember that cooking time does not scale linearly. A doubled cake takes longer, but not twice as long; a doubled soup takes roughly twice as long. The cooking-time guide gives sensible starting estimates by dish geometry.
Scaling notes
Scaling Japanese Katsudon
Japanese Katsudon is written for around four servings as it stands on this page — scaling it up for a party or down for a meal-for-one is the small math problem most home cooks face every week. Here's how this particular dish responds to scaling, what changes linearly, and what doesn't.
Pork shares scaling rules with beef — braising time is collagen-driven and mass-independent, while quick-cook methods like searing scale by the piece. Japanese Katsudon benefits from weight-based ingredient measurement when scaled up: pork roasts in particular vary significantly in actual yield, and a recipe written for "2 lb shoulder" can mean anything from 800 g to 1.1 kg of cooked meat.
This recipe calls for eggs, which are the trickiest ingredient to scale to non-integer multiples. A US "large" egg weighs about 50 g; if a fractional scaling lands on, say, 1.5 eggs, beat one egg and weigh 25 g of the beaten mixture rather than guessing. The same goes for halving recipes — half an egg is 25 g of beaten egg, not a dramatic estimate.
Skip the math entirely — ScaleRecipe's scaler rewrites every ingredient line above with proper culinary fractions and smart unit promotion the moment you change the serving count. Open the scaler →
Beyond the recipe
Substitutions & make-ahead — Japanese Katsudon
Two things home cooks ask about most when they're outside the recipe's exact assumptions: what swaps work for which ingredients, and how the dish behaves when you make it ahead. Both depend on what Japanese Katsudon is doing structurally — here's the practical version.
Substitution ideas
Eggs
For binding (cookies, quick breads, meatballs): 1 large egg ≈ 1 tbsp ground flaxseed + 3 tbsp water, rested 5 minutes until gelled — structurally closest to a real egg. For moisture without structure (cakes, brownies): ¼ cup unsweetened applesauce or mashed banana per egg, accepting some loss of rise.
For weight-based swaps and arbitrary quantities, the ingredient density converter and the cup-to-grams chart cover most pantry staples.
Make-ahead and storage
Pork shoulder and slow-cooked pork dishes (Japanese Katsudon included if it falls in that family) improve overnight as the fat redistributes and flavours integrate. Cured pork — bacon, ham, sausage — keeps well refrigerated but loses its crisp edges in storage; re-crisp in a hot skillet or under the broiler. Quick-cooked pork chops are best served the day they're cooked; the meat tightens and dries through the refrigerate-and-reheat cycle.
Recipe video
Japanese Katsudon
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Cooking aids
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Each opens in a new tab so the timer keeps running. The math is auditable on the guide page below each converter, with worked examples and where the numbers come from.
Volume
Tablespoons, teaspoons, cups, ml, fluid ounces — every culinary volume unit, with US/metric/imperial cups handled distinctly.
OpenWeight
Grams, ounces, pounds, kilograms — exact for any ingredient, plus the volume-to-weight conversions for ~40 pantry staples.
OpenTemperature
Fahrenheit, Celsius, gas mark — translate any oven temperature, with notes on conventional vs convection.
OpenCooking time
The cube-root rule for scaling up, the differences between meat / cake / soup geometry, and sensible starting estimates.
OpenPan size
9-inch round vs 8-inch square vs 13×9. The math is surface area, not diameter — and the converter shows you both.
OpenLength
Inches and centimetres — for when a recipe says “cut into 1-inch pieces” and your ruler is metric.
OpenIngredient density
A cup of flour weighs 120 g; a cup of honey weighs 340. The full table of ~40 staples, with sources.
OpenOpen in main scaler
Edit the recipe text, scale by serving count, and copy the result. Same parser as the in-page scaler, more room to work.
OpenFrom the journal
Original essays on the small details.
The why behind the technique — original writing on the ingredient and equipment choices that separate a good cook from a frustrated one.
Reading a recipe like a chef
The 30-or-so recipe terms that show up most often, decoded
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Cooking for one — scaling principles
The math, the practical realities, and the recipes designed for one from the start
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How long do leftovers actually last?
Beyond the USDA's 3–4 days: the variables that actually determine the safe window
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Go deeper
Where this recipe sits in the wider tradition.
Each guide below is a real essay on the cuisine or the category — pillars, staples, techniques worth learning — paired with a curated grid of recipes filed under it.
Cuisine guide · Japanese
Cooking the Japanese way
A cuisine of seasonality, restraint, and the dignity of a single ingredient.
Open the guideCategory guide · Pork
How to cook in this category
The most universally cooked meat — every cuisine has its own pork tradition.
Open the guideKeep exploring
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