I weigh my food before when feasible.
Of course, if your recipe calls for a raw amount (e.g. 1/4 lb. ground beef) use that; if it calls for a cooked amount use that (as in cans of beans ... already cooked).
And of course it can be entertaining if not super informative to weigh before-and-after, mainly to see how much water was gained or lost in the cooking process.
"Habe nun, ach! Philosophie, Juristerei und Medizin, Und leider auch Theologie Durchaus studiert ..." (Goethe, "Faust")
| current weight: 193.3