Once I have made a recipe a couple of times, I tend to follow my instincts rather than strict portion sizes.
When following a new recipe, however, I have often wondered about how an ingredient's weight should be interpreted.
For example, if a recipe calls for 500g of pumpkin, diced into 1cm cubes, does convention expect me to use a 500g cut of pumpkin, that I then de-seed and dice, or 500g of 1cm pumpkin cubes pumpkins?