Great question — answering as the UphillTech team:
There are a few main variables that will result in soggy, swollen pasta leftovers. For example, the sauce you serve the pasta with could be leaching out liquid which is being absorbed by the pasta. This is especially likely if you often find water pooling underneath your Spag Bol. This can be avoided by cooking the sauce for longer so that the excess water evaporates. As you said though, standing for long periods is difficult for you. So rather than standing in front of the cooker for a few hours, stirring the sauce and making sure it doesn't catch. You could bake the sauce in the oven, on a low to medium gas mark / temperature. The other really great thing you can do is to use a small...
Full answer by Hollis Hurlbut: https://cooking.stackexchange.com/a/130528 (CC BY-SA 4.0).
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