A satisfying plant-based pasta dish — spaghetti tossed in a rich tomato marinara loaded with red lentils, garlic and Italian herbs. High in plant protein and fibre.
Red lentils dissolved into a rich tomato marinara is a classic Italian-inspired trick for adding plant protein and body to a pasta sauce without any meat.
The lentils cook down quickly and almost disappear into the sauce, creating a luxuriously thick texture that clings beautifully to every strand of spaghetti.
Rinse the red lentils under cold water. Place in a small pot with 400 ml water, bring to a boil and simmer for about 12 minutes until completely soft and beginning to break down. Drain any excess water and set aside.
Heat the olive oil in a wide pan over medium heat. Add the onion and cook for 5 minutes, stirring, until soft and translucent. Add the minced garlic and cook for 1 minute until fragrant — do not let it brown.
Pour in the crushed tomatoes, add the oregano, basil, chilli flakes (if using), salt and pepper. Stir to combine and bring to a gentle simmer.
Add the cooked lentils to the marinara sauce. Stir and simmer for 10 minutes, allowing the lentils to absorb the sauce and thicken it. Taste and adjust the seasoning.
Meanwhile, cook the spaghetti in well-salted boiling water until al dente according to pack instructions. Drain, reserving 60 ml pasta water. Add the spaghetti to the sauce and toss, adding a splash of pasta water if needed to loosen. Serve garnished with fresh basil and grated Parmesan if desired.
The glycemic index (GI) measures how quickly a food raises blood sugar, while the glycemic load (GL) measures how much a full serving raises it. Together they give the complete picture.
A low value (≤55) means a gradual rise in blood sugar — the most suitable range for diabetes and insulin resistance.
Glycemic load reflects the impact of the full serving. To lower it: take half a serving, or pair the recipe with a source of protein and fiber.
* Percent Daily Values are based on a 2,000-calorie diet per FDA food-label reference values — your daily needs may be higher or lower. Values are derived from the recipe's ingredients via the USDA database.
The most common problems when preparing Lentil Marinara Spaghetti, and how to fix them:
Simmer uncovered for an extra 5 to 10 minutes to reduce, or add a tablespoon of tomato paste for concentrated body.
Toss immediately after draining with a splash of pasta water. Do not rinse cooked pasta — this washes away the starch that helps the sauce adhere.
Add a small pinch of sugar or a splash of carrot juice to balance the acidity of the tomatoes.
Cook the lentils a little longer — red lentils should be completely soft before adding to the sauce.
Store the sauce and pasta separately in airtight containers for up to 3 days. Pasta absorbs sauce as it sits; thin with a splash of water when reheating.
Freeze the lentil marinara sauce (without pasta) for up to 2 months. Thaw overnight in the refrigerator, reheat and cook fresh pasta to serve.
Reheat sauce in a pan over gentle heat with a splash of water. Add freshly cooked pasta or microwave the combined dish covered for 2 minutes, stirring halfway.
Cool within 2 hours of cooking and refrigerate. Do not leave cooked pasta at room temperature longer than two hours [2].
| Original Ingredient | Tested Substitute | Ratio | Flavor Difference |
|---|---|---|---|
| Spaghetti | Wholemeal spaghetti or lentil pasta | same weight | Wholemeal pasta increases fibre; lentil pasta makes this gluten-free and boosts protein further |
| Red lentils | Canned green lentils, drained | same weight | Green lentils hold their shape and give a chunkier texture to the sauce |
| Canned crushed tomatoes | Fresh ripe tomatoes, blended | same weight | Adds freshness in peak tomato season; cook slightly longer to reduce |
| Parmesan | Nutritional yeast | half the amount | Gives a cheesy, umami note and keeps the dish vegan and dairy-free |
| Number of servings | Ratio |
|---|---|
| 2 (single × 2) | Half the ingredients |
| 4 (base) | Ingredients as is |
| 6 (family) | 1.5x the ingredients |
| 8 (hosting) | Double the ingredients |
Reserve a cup of the starchy pasta cooking water before draining — adding a splash to the sauce when tossing the pasta creates a silky, emulsified coating that no amount of oil alone can achieve. For a gluten-free version, use lentil-based or chickpea pasta.
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