Originally Posted by Andy M.
I usually season at the beginning when I'm sweating the onion (and any other veggies) and again when all the ingredients are in the pot to begin the cooking process. Adjusting at the end is the final step.
Same here, you absolutely need to add salt in the begining, when sweating onions.
Who is to say you won't Over salt at the end, at least if that happens in the begining you can still add more, say tomatoes, or whatever it is you're making. Not so easily done at the end.