Mapo Tofu
Silky tofu in a tingly, spicy bean-paste sauce.
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Three Delights from Earth
Eggplant, potato and green pepper, fried then tossed in a savoury sauce — a classic Northeastern home dish. Adapted for a home kitchen from the original ClouChef R&D report — 地三鲜, report 71.
Original poster image from clouchef.com (poster: 地三鲜_71.jpeg). This is the hero poster only, not a step-by-step photo set.
Prep: 10 minutesCook: 10 minutesTotal: 20 minutesServings: 2–3Difficulty: MediumRegion: Northeast ChinaFlavour: Savoury, lightly sweet
Why this works
Three vegetables, three textures, one sauce — and the dish only works if the frying order is respected. Potato goes first because it needs the longest time to cook through; eggplant follows, fried just until its skin wrinkles, so it turns silky without collapsing; green pepper goes last for only 30 seconds, so it stays bright and crisp. Frying at 170 °C matters too: cooler oil makes the eggplant drink fat and turn greasy, hotter oil browns the outside while the potato stays hard inside. The sauce itself is deliberately simple — tomato sauce fried until its red oil appears, then soy, sugar and salt — because its job is to glaze, not to compete. The final thickening is timed to the last ten seconds before serving, so the gloss coats the vegetables instead of pooling underneath them. With plain steamed rice it needs nothing else, and the contrast of silky eggplant, fluffy potato and crisp pepper explains its long life as a home favourite.
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Ingredients
| Ingredient | US | Metric | Substitute / note |
|---|---|---|---|
| Eggplant (long purple), unpeeled, cut into 2 cm chunks | 5.3 oz | 150 g | Do not peel — the skin holds the pieces together and adds texture. |
| Potato (yellow-fleshed), peeled, cut into 1.5 cm cubes | 5.3 oz | 150 g | Soak in water for 5 minutes to remove surface starch, then drain. |
| Green pepper, deseeded, cut into 3 cm diamond pieces | 3.5 oz | 100 g | Pointed or round green peppers both work, per the report. |
| Tomato sauce (sweet canned type) | 2 tbsp | 30 g | Western tomato ketchup is the closest substitute (adaptation). |
| Sugar | 2 tsp | 10 g | — |
| Salt | 1/2 tsp | 3 g | — |
| MSG (optional) | 1/4 tsp | 2 g | Optional at home (adaptation); omit if you prefer. |
| Light soy sauce | 1 tbsp | 15 ml | — |
| Scallion, chopped | 2 tsp | 10 g | — |
| Ginger, minced | 1 tsp | 5 g | — |
| Garlic, minced | 2 tsp | 8 g | — |
| Corn starch, for the final slurry | 1 tsp | 5 g | Mixed with 20 ml water. |
| Neutral oil, for frying | about 1 cup | 250 ml | Adaptation: the report lists 50 ml, which cannot deep-fry the vegetables at home. Use enough oil to come halfway up the pieces in a wok or skillet, and drain well. |
| Neutral oil, for the sauce base | 2 tsp | 10 ml | — |
Equipment
- Wok or deep skillet for frying — no wok required (adaptation)
- Thermometer for the oil
- Slotted spoon or spider
Steps
- Cut and prepare the vegetables. Cut the unpeeled eggplant into 2 cm chunks, the peeled potato into 1.5 cm cubes, and the deseeded pepper into 3 cm diamond pieces. Soak the potato in water for 5 minutes, then drain. Chop the scallion, ginger and garlic.
- Fry in order at 170 °C. Heat the frying oil to 170 °C. Fry the potato for 2 minutes until lightly golden, lift out and drain. Fry the eggplant for 1.5 minutes until its skin wrinkles, lift out and drain. Fry the pepper for 30 seconds until just cooked, lift out and drain.
- Fry the sauce. Leave about 10 ml oil in the pan. Bloom the scallion, ginger and garlic for 10 seconds, then add the tomato sauce and fry on low heat for 15 seconds until the red oil appears. Stir in the light soy, sugar, salt and MSG if using.
- Toss and thicken. Return all the fried vegetables and stir-fry on high heat for 20 seconds. Pour in the starch slurry, toss to a light gloss, and serve immediately.
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Technique: fry in order, thicken last
The frying order is the technique: potato needs 2 minutes, eggplant 1.5 minutes, pepper 30 seconds — reverse the order and something will be either raw or mushy. Keep the oil at 170 °C throughout; a thermometer beats guessing, because eggplant at low temperature turns into an oil sponge. And the starch slurry goes in only in the last ten seconds: too early and the sauce turns gluey, too late and it never coats. All vegetables must be cooked through to at least 75 °C at the centre (home food-safety guidance, added as an adaptation).
Variations
- Lighter version.: Roast the cut vegetables in a hot oven with a little oil until tender, then toss in the same sauce (adaptation). The texture will be drier and less silky than the fried version.
- With meat.: The report offers an upgraded version with added chicken or pork slices; stir-fry the meat first, set aside, and return it with the vegetables (adaptation for the order).
- Less sweet.: Reduce the sugar by half for a more savoury finish (adaptation). The tomato sauce still gives the glaze its colour.
Frequently asked questions
Why is my eggplant greasy?
The oil was probably below 170 °C, or the eggplant was fried too long. Hot oil and a short fry keep it silky rather than spongy.
Can I skip the deep-frying?
You can roast or pan-fry instead (see Variations), but the classic silky texture comes from frying. Expect a different, drier result.
Why did my sauce go gluey?
The starch slurry was probably added too early or in too large a quantity. Use the stated 5 g starch in 20 ml water, and add it last.
Storage
Best eaten fresh, while the pepper is still crisp. Leftovers keep 1 day refrigerated; reheat in a hot pan until steaming throughout and expect the vegetables to soften. Do not reheat more than once.
Three Delights from Earth — Recipe Card
Fried eggplant, potato and green pepper tossed in a savoury tomato-soy glaze.
Prep: 10 minutesCook: 10 minutesTotal: 20 minutesServings: 2–3
Ingredients: 150 g eggplant; 150 g potato; 100 g green pepper; 30 g tomato sauce; 10 g sugar; 3 g salt; 2 g MSG (optional); 15 ml light soy; 10 g scallion; 5 g ginger; 8 g garlic; 5 g corn starch + 20 ml water; oil for frying and for the sauce.
Steps: 1) Cut vegetables; soak potato 5 minutes. 2) Fry at 170 °C: potato 2 minutes, eggplant 1.5 minutes, pepper 30 seconds. 3) Bloom aromatics, fry tomato sauce to red oil, season. 4) Return vegetables, toss 20 seconds, thicken with starch slurry, serve.
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Source note: ingredients, quantities and steps are adapted from the original ClouChef R&D report for 地三鲜 (data/reports/71.md). The report's pricing, margin and marketing sections are deliberately omitted here; no B2B cost is presented as a home-cook cost. Original poster image: clouchef.com (地三鲜_71.jpeg). Serving size for home use (2–3), the ketchup substitute, the frying-oil quantity, the optional MSG and the safety temperature are adaptations and are labelled as such.