Out of Pasta water, one case
Pasta water substitute: starchy water alternatives
6 options, ranked, with the exact amount
Use Cornstarch slurry
Per ¼ cup pasta water
1 tsp cornstarch + 2 tbsp cold water
The best pasta water substitutes are cornstarch slurry (1 tsp cornstarch + 2 tbsp water), flour slurry (1 tbsp flour + 2 tbsp water), or reserved pasta water from another batch. For immediate use, mix 1 tsp cornstarch with 2 tbsp cold water, then add to sauce.
- Verdict —
- Tweak it
- What changes —
- neutral taste, similar texture
- Best for —
- Creamy pasta sauces
One casethe full pasta card
Every option, one card
Ranked| # | Substitute | Instead of ¼ cup pasta water | Verdict |
|---|---|---|---|
| 1 | Cornstarch slurryCreamy pasta sauces | 1 tsp cornstarch + 2 tbsp cold waterTweak it | Tweak it |
| 2 | Flour slurryHearty pasta sauces | 1 tbsp flour + 2 tbsp cold waterTweak it | Tweak it |
| 3 | Reserved pasta waterAny pasta sauce | Same amountWorks | Works |
| 4 | Potato starchGluten-free pasta sauces | 1 tsp potato starch + 2 tbsp cold waterTweak it | Tweak it |
| 5 | Arrowroot powderGluten-free sauces | 1 tsp arrowroot + 2 tbsp cold waterTweak it | Tweak it |
| 6 | Tapioca starchGluten-free sauces | 1 tsp tapioca + 2 tbsp cold water | No verdict on record |
Cornstarch slurry
neutral taste, similar texture
Mix cornstarch with cold water first, then add to hot sauce while stirring. This prevents lumps and creates the same thickening effect as starchy pasta water.
- Best for
- Creamy pasta sauces, Alfredo sauce, Carbonara, Any pasta sauce
Most reliable substitute, creates smooth, glossy sauce.
Flour slurry
neutral taste, similar texture
Mix flour with cold water to create a smooth paste, then whisk into hot sauce. Cook for 2-3 minutes to remove the raw flour taste.
- Best for
- Hearty pasta sauces, Ragu, Bolognese, Thick sauces
Good substitute, may need longer cooking to remove raw flour taste.
Reserved pasta water
identical taste and texture
If you have leftover pasta water from cooking another batch of pasta, this is the good substitute. It contains the same starch content and flavor.
- Best for
- Any pasta sauce, Authentic Italian dishes, When you have extra pasta water
Best substitute if you have pasta water from another batch.
Potato starch
neutral taste, similar texture
Potato starch creates an even smoother texture than cornstarch and is gluten-free. Mix with cold water first, then add to sauce while stirring.
- Best for
- Gluten-free pasta sauces, Smooth sauces, Delicate flavors
Gluten-free option, creates very smooth sauce.
Arrowroot powder
neutral taste, similar texture
Arrowroot powder is gluten-free and creates a clear, glossy sauce. It's more expensive than cornstarch but works well for special diets.
- Best for
- Gluten-free sauces, Paleo diets, Clear sauces, Fruit-based sauces
Gluten-free and paleo-friendly, creates glossy sauce.
Tapioca starch
neutral taste, slightly different texture
Tapioca starch is gluten-free and creates a slightly chewy texture. It's commonly used in Asian cooking and works well in pasta sauces.
- Best for
- Gluten-free sauces, Asian-inspired pasta, When you want slight chewiness
Gluten-free option, creates slightly chewy texture.
How it behaves in this recipe
Pasta water is essential because it contains starch released during cooking that helps thicken sauces and makes them cling to pasta. The starch acts as a natural thickener and emulsifier, creating the good sauce consistency. Substitutes work by providing similar thickening power through starches or other binding agents.
Tips for substituting pasta water
7 tips- Always mix starch with cold water first to prevent lumps
- Add slurry gradually while stirring constantly
- Bring sauce to a gentle boil after adding starch to activate thickening
- For cornstarch, cook for 1-2 minutes; for flour, cook for 2-3 minutes
- Start with less starch and add more if needed - you can always add more
- If sauce becomes too thick, add a little water or broth to thin it
- For authentic Italian dishes, try to use real pasta water when possible
Notes on pasta water
- Use the starchy water from cooking rice or potatoes as a substitute
- Let your sauce reduce naturally by cooking it longer to thicken
- Add a small amount of grated cheese to help thicken and bind the sauce
- Use a roux (flour and butter mixture) for more traditional sauce thickening
Questions
5 questionsCan I use cornstarch instead of pasta water?
Yes, mix 1 teaspoon cornstarch with 2 tablespoons cold water, then add to your sauce while stirring. This creates the same thickening effect as starchy pasta water.
What's the difference between pasta water and regular water?
Pasta water contains starch from the cooking pasta, which helps thicken sauces and helps them cling to the pasta. Regular water won't provide this thickening effect.
Can I use flour instead of pasta water?
Yes, mix 1 tablespoon flour with 2 tablespoons cold water, then add to your sauce. Cook for 2-3 minutes to remove the raw flour taste.
Why is pasta water so important in Italian cooking?
Pasta water contains starch that helps create the good sauce consistency and helps the sauce cling to the pasta. It's a key technique in authentic Italian pasta preparation.
What if I don't have any pasta water and no thickeners?
You can use a small amount of the starchy water from cooking rice or potatoes, or simply use regular water and let the sauce reduce to thicken naturally.