Fifty Percent Red Onion, twenty five percent Celery, twenty five percent Carrot. Note to self: finer dice on the carrot next time.
Medium Heat, Small Dice, Olive Oil. This is how it looked at the start. Still organized and intact.
One hour in (60 minutes in metric). Veg is breaking down like a fraction.
Two hours in. Things are falling apart in a good way. Lower the heat and/or add more oil if it starts to stick.
Three hour in. Concentrated flavor. Freeze in ice cube trays to use later.