Ever wonder why everyone tells you to salt pasta water "like the sea"? You probably heard it raises the boiling point. It does — by about 0.5°C. That's nothing. So what's really going on?
It's about salt getting into the pasta
When pasta hits boiling water, it's surprisingly porous for the first three to four minutes. Salt diffuses inward, all the way to the centre of each strand. If your water is bland, your pasta is bland — and no amount of finishing salt at the end will fix it. The outside gets seasoned. The inside stays flat.
Add salt to a pot of cold water, then boil it. Don't wait until the water is already boiling — by then your pasta is already going in.
How much salt?
About 10 g of salt per litre of water. Roughly two tablespoons of kosher salt for a big pot. It should taste like a mild broth — slightly aggressive when you taste it, just right when it ends up in the pasta.
Most people under-salt by a factor of three. Try it once at the proper amount. You won't go back.
The fun part — why "starchy water" matters too
That cloudy water at the end? It's not waste. As pasta cooks, starch leaches into the water. Reserve a cup before you drain. Stir a splash into your sauce — the starch acts as an emulsifier, binding fat and water into a glossy, clinging coat.
That's the difference between sauce that pools at the bottom of the bowl and sauce that hugs every strand. Both come from the same pot.
Quick recap
- Salt the water before boiling, generously — about 10 g/L.
- Save a cup of starchy water before you drain.
- Splash it into your sauce while you toss.
Three habits. Pasta you'd actually order.
