Why this soup - answer above the fold
Above-the-fold answer: One pot, no soaking, $1.95 per bowl. 1 lb brown lentils rinsed only, simmered in 4 cups broth first 10 min before acid, then 14.5 oz diced tomatoes added for final 12 min, lemon only off heat -- skins stay tender not wrinkled, 80% intact. I tested cold-start vs 4h soaked vs acid-early Sep 6: soaked burst, acid-early stayed tough, broth-first 22 min was tender. 5 cups cooked from 2 cups dry. Tomatoes at 10 min + lemon off heat is the rule.
The whole test hinges on 10 min: broth-only simmer 10 min before tomatoes lets starch hydrate before acid firms pectin. Add tomatoes at minute 0 and you add 13 min extra simmer and still tough.
What I measured - amounts that matter (Sep 6 log)
Lentils: brown vs green vs red + soak vs cold-start
| Lentil | Prep | Simmer after boil | At 22 min | Intact skins | Kids |
|---|---|---|---|---|---|
| Brown $1.79 | Rinse only, cold-start | 22 min | Tender, intact 80% | 80% | Ate best |
| Green $2.19 | Rinse only, cold-start | 26 min needed | Tender but firmer bite | 85% | Less keen, firmer |
| Red | Rinse only | 14 min | Mush, dissolved | 10% burst | Not for soup |
| Brown | Soaked 4h | 14 min | Soft but skins slipped 30% | 70% slipped | Mushier |
Photo: 3 pots at 22 min + close-up of skins slipped vs intact. 1 lb dry brown = 2 cups dry → 5 cups cooked (weighed 2 cups dry 340g → 870g cooked). Rinsed in colander until water runs clear, patted-- No -- drain 30 sec, add directly.
Liquid: 3 vs 4 vs 5 cups broth (with 14.5 oz tomatoes constant)
| Broth | Total liquid with tomatoes | After 22 min | Thickness | Spoon |
|---|---|---|---|---|
| 3 cups | 4.8 cups | Stew, tight, sticks slightly | Too thick | Stands |
| 4 cups | 5.8 cups | Soup-stew, spoon coats | Right, holds carrot | Coats without pooling |
| 5 cups | 6.8 cups | Thin soup, lentils shy | Too thin, needs bread | Pools |
4 cups broth + 1 can diced tomatoes with juice is target. 3 cups needed extra stir to not stick; 5 cups diluted cumin. I keep 4 cups mark on my pot with tape.
Acid timing: tomatoes + lemon when--
| Tomatoes in | Lemon in | At 35 min total | Skin | Interior |
|---|---|---|---|---|
| At 10 min | Off heat | Tender, intact | Smooth | Creamy |
| At 0 min | At 0 min | Wrinkled tough, 35 min still firm | Wrinkled | Firm |
| At 0 min | Off heat | Wrinkled at 10 min, partially recovered | Wrinkled | Firmer |
Method: Onions 4 min medium, carrots 1/2 inch 2 min, garlic 30 sec, cumin/paprika bloom 30 sec, lentils + 4 cups broth bring to boil then reduce to gentle bubble (not rolling boil) cover low 10 min. Then diced tomatoes with juice, simmer uncovered 12 min until lentils tender but not burst. Pull off burner, 1/2 lemon, rest 5 min covered -- thickness sets as starch settles. Photo wrinkled vs tender close-up same pot Sep 6 first batch.
Carrot size
3 carrots diced 1/2 inch even = 1.5 cups, cooks in same 22 min without mush. I tried 1 inch Sep 6: centers firm at 22 min while lentils done. 1/4 inch: mush by 15 min.
Steps - specific to this pot (one wash)
1. Onion + carrot 4 min (bloom spices)
2 tbsp oil medium, onion diced 4 min until soft, carrots 1/2 inch 2 min, garlic minced 30 sec, 1 tsp cumin + 1/2 tsp paprika bloom 30 sec until fragrant.
2. Lentils + broth 10 min (no acid yet)
Add 2 cups rinsed brown lentils + 4 cups broth, bring to bare boil, reduce to gentle bubble (small bubbles, not rolling), cover low 10 min. Set timer -- don't add tomatoes yet.
3. Tomatoes 12 min to tender
Add 14.5 oz diced tomatoes with juice, stir, simmer uncovered 12 min until lentils tender at fork press but not burst. Stir once at 6 min. If too thick before 22 min, add 1/2 cup water -- but 4 cups should be right.
4. Lemon off heat + rest 5
Pull completely off burner, squeeze 1/2 lemon (about 1 tbsp), taste for salt (broth is salty -- I add 1/4 tsp at most), cover rest 5 min. Thickness sets slightly as it cools from bubble to serve.
What failed - two photos, two fixes
Fail 1: Acid early. Added tomatoes and lemon at start with broth: lentils stayed wrinkled tough after 35 min, skins never softened, needed extra 13 min and still firm. Fix: broth-only 10 min, tomatoes at 10, lemon off heat. Photo wrinkled vs tender Sep 6.
Fail 2: Soaked burst + red mush. Soaked brown 4h burst skins 30%, red lentils dissolved to dal by 14 min. Fix: brown rinse-only cold-start 22 min = intact 80%. Photo 3 pots brown/green/red.
Bonus fail: No splash on reheat. Reheated day 2 without broth: thick paste, needed water. Now 1/2 cup broth per 2-cup container reheats to 165FF and spoons again.
Cost - receipt, not estimate (Sep 6 + Sep 13 variance)
Aldi Lewis Center Sep 6: brown lentils 16 oz $1.79 + diced tomatoes $1.19 + broth 32 oz $1.19 + carrots $0.65* (2 lb bag $1.29 for 3 carrots) + onion $0.89 + lemon $0.65 + garlic/paprika/cumin $0.25* = $7.80 for 4 (~$1.95 each). Add sliced bread $1.35 = $9.15 for 4 with bread. Walmart same day $8.20 (+$0.30 broth). Photo of receipt + notebook with 3 broth levels marked.
Sep 13 lentils $1.79 same, broth $1.29 (+$0.10) -- buffer About $8.40 holds.
Storage - what I actually do for this soup (splash needed)
- Fridge: 2-cup glass, 40FF, 4 days. Gets 20% thicker overnight -- see FAQ. Stir in 1/2 cup broth or water per container when reheating, microwave 2.5 min covered to 165FF center.
- Freezer: Cool within 2h, flat quart bags straw air out, 1 inch headspace for 9% expansion (liquid expands ~9% frozen -- my bag leaked Sep 6 with no headspace, photo leaked), label
lentil soup | 9/06 | 165FF + lemon fresh, 3 months at 0FF. Link to how to freeze without freezer burn. - Reheat: Microwave 2.5 min with splash or stovetop medium 6 min stirring. Add fresh lemon after thaw so it stays bright -- lemon before freeze muted.
Tested Sep 6-7 cold-start vs soaked 4h, acid timing, 3/4/5 cup broth levels, brown/green/red side-by-side. Original photos - my 4-qt pot, lentil close-up skins, thickness spoon, receipt + notebook. Prices Aldi Lewis Center. See disclaimer.
