Keto Spaghetti Squash Puttanesca
Keto spaghetti squash puttanesca uses spaghetti squash - a variety of winter squash that naturally forms spaghetti-like strands when baked. Combined with a bold puttanesca sauce of tomatoes, black olives and capers, it creates an authentic pasta experience with only 8 g of net carbs.
Key facts at a glance
- Prep time: approx. 45 minutes (35 min. passive in the oven) - a relaxed weekend dish.
- Approx. 8 g net carbs and 22 g fat per serving.
- Ingredients: spaghetti squash, canned tomatoes, black olives, capers, garlic, olive oil.
- Works as a vegetarian keto dinner; an impressive dish for guests.
Ingredients
Makes 2 servings from one medium spaghetti squash (approx. 800 g).
| Amount | Ingredient | Note | ||
|---|---|---|---|---|
| Spaghetti squash | approx. 1 medium | |||
| approx. 1 medium | ||||
| Canned tomatoes | chopped, no added sugar | |||
| chopped, no added sugar | ||||
| Black olives | pitted, halved | |||
| pitted, halved | ||||
| Capers | 2 tbsp, rinsed | |||
| 2 tbsp, rinsed | ||||
| Garlic cloves | - | |||
| Olive oil | approx. 30 g; 3 tbsp | |||
| approx. 30 g; 3 tbsp | ||||
| Salt | to taste | |||
| to taste | ||||
| Pepper | to taste | |||
| to taste | ||||
| Oregano | to taste | |||
| to taste | ||||
| Parsley | to taste | |||
| to taste | ||||
Preparation
Halve the spaghetti squash, rub with olive oil and bake at 200 C (400 F) for 35-40 minutes. Scrape out the strands with a fork. Prepare the puttanesca sauce from tomatoes, olives, capers and garlic and spoon it over the squash strands.
Why spaghetti squash is an ideal pasta substitute for keto
Spaghetti squash contains approx. 5.5 g net carbs per 100 g - clearly more than zucchini (2.1 g) or shirataki (0 g), but still far below spaghetti (31 g). The real advantage: without any processing, the squash naturally forms long, spaghetti-like strands when baked. The puttanesca sauce of olives, capers and tomatoes adds intense umami flavor and only about 3 g of extra net carbs per serving. Black olives also deliver 5 g of fat per 30 g and are virtually carb-free.
Source: USDA FoodData - Spaghetti Squash, cooked , FDDB - Black Olives
What is spaghetti squash?
Spaghetti squash (Cucurbita pepo) is an oblong, oval winter squash with creamy yellow flesh. When baked or boiled, the flesh separates into long, spaghetti-like fibers. You can find it in well-stocked supermarkets and farmers' markets (mainly in fall, frozen year-round). Per 100 g it contains approx. 5.5 g net carbs, 0.6 g fat and 0.6 g protein.
Puttanesca: the naturally keto-friendly pasta sauce
Puttanesca sauce consists of tomatoes, olives, capers, garlic and olive oil - all of them low in carbs or carb-free. Capers contain only approx. 0.2 g net carbs per tablespoon (9 g). Black olives bring 0.8 g net carbs per 30 g. The sauce is naturally keto-friendly as long as no sugar is added.
How do I serve and vary spaghetti squash puttanesca?
Serve the squash strands directly in the squash shell as an edible plate - it looks impressive and saves on dishes. From personal experience: only scrape the squash after it has cooled fully (5 minutes) - hot squash tends to turn mushy instead of forming strands.
Meal prep and storage
Store the baked spaghetti squash with its scraped strands in the fridge for up to 3 days. Keep the puttanesca sauce separate and combine when reheating. The sauce develops a more intense flavor as it sits - ideal for meal prep.
Traditional version with anchovies
The classic puttanesca recipe contains anchovies - add 2-3 fillets in oil to the sauce and let them simmer until they dissolve. Anchovies are practically carb-free (0 g carbs) and bring intense umami flavor plus 0.5-1 g of extra salt per fillet. That makes the sauce even more savory and is the more authentic version.
Which tips help with baking spaghetti squash?
- Halve the spaghetti squash lengthwise with a sturdy knife - it is very hard; secure it on a damp cloth for safety.
- Rub the cut surfaces with olive oil, season with salt and place cut-side down on the baking sheet - this cooks the flesh more evenly.
- Bake at 200 C (400 F) for exactly 35-40 minutes; test by piercing the skin with a fork - it should give slightly.
- Let the squash cool for 5 minutes, then scrape out the strands with a fork in gentle circular motions - too much pressure crushes the strands.
- For extra flavor, toss the strands with a little garlic butter before topping with the puttanesca sauce.
Nutrition values
| Nutrient | Per 100 g | Per serving | Keto rating |
|---|---|---|---|
| Calories | approx. 96 kcal | approx. 320 kcal | Light keto dish; energy from olive oil and squash. |
| Light keto dish; energy from olive oil and squash. | |||
| Fat | approx. 6.6 g | approx. 22 g | Olive oil and olives as main fat sources; high MUFA share. |
| Olive oil and olives as main fat sources; high MUFA share. | |||
| Net carbs | approx. 2.4 g | approx. 8 g | Moderate for keto; the squash is the main source. Fits well into a daily budget. |
| Moderate for keto; the squash is the main source. Fits well into a daily budget. | |||
| Sugar | approx. 1.3 g | approx. 4.2 g | Natural sugar from squash and tomatoes; no added sugar. |
| Natural sugar from squash and tomatoes; no added sugar. | |||
| Protein | approx. 3.0 g | approx. 10 g | Low; add protein for a complete keto dinner. |
| Low; add protein for a complete keto dinner. | |||
| Salt | approx. 0.43 g | approx. 1.4 g | Moderate to slightly elevated; capers and olives bring plenty of flavor and salt. |
| Moderate to slightly elevated; capers and olives bring plenty of flavor and salt. | |||
Note: Nutrition values are estimated averages per 100 g and per serving and may vary depending on ingredients, brands, portion size, and preparation. They do not replace individual nutrition or medical advice.
FAQ
Where do I buy spaghetti squash?
Spaghetti squash is available from August to November at farmers' markets and well-stocked supermarkets. The rest of the year you can often find it frozen (already shredded into strands) or at organic shops. Online it can be ordered year-round.
Is spaghetti squash keto-friendly?
Yes, with approx. 5.5 g net carbs per 100 g it is keto-friendly - though higher in carbs than zucchini or shirataki. A serving of about 200 g of squash strands provides around 5-6 g of net carbs from the squash alone. Within a daily budget of 20-25 g net carbs, that is easy to plan for.
Can I leave out the capers?
Yes, capers are optional. They add acidity and umami to the puttanesca sauce. If you do not like them, you can leave them out or replace them with a squeeze of lemon juice and a few more olives.
How do I know when the squash is done?
Pierce the outside of the skin with a fork or knife - it should give slightly but not break. Alternatively: the strands should come loose easily when the squash is done.
Can I boil the spaghetti squash instead of baking it?
Yes. Cook the halved squash cut-side down in a large pot of boiling water for 20-25 minutes. Baking, however, gives more roasted flavor and a firmer strand texture - which is why I recommend baking for this dish.