The batch you cannot get back
Most people who roast nuts have had one perfect batch. The colour was right, the flavour was deep without being sharp, and it went in the tin. Then the next batch was not that, and neither was the one after, and there was no way to work out what was different — because nothing was written down, and the thing that changed was probably not the thing you would have thought to write down anyway.
A profile fixes that. Not a recipe — a recipe is a temperature and a timer, and with nuts those two numbers do not control the outcome. A profile is the temperature of the product over time, plus the conditions that produced that curve.
Nuts have to have their feedback installed
Coffee gives you first crack. Cacao gives you a lighter version of the same thing. Nuts give you nothing at all — no crack, no reliable sound, no announcement. What you have instead is colour, which lies on dark-skinned nuts and lags on dense ones, and smell, which arrives usefully but late.
Which means the only instrument that describes a nut roast honestly is the temperature of the nuts themselves, plotted against time. Everything below assumes you can see that number. If you cannot, you can still keep records and they are still worth keeping, but you will be recording the oven rather than the nuts, and the two diverge in ways covered in temperature and time.
What to write down
More than feels necessary. The variable that explains a strange batch is almost always the one you decided was not worth noting.
- Exactly what went in. Not "pecans" — pecan halves or pieces, in-shell or shelled, skin-on or blanched, and the crop or lot if you know it.
- Charge weight. Batch size changes the curve more than almost anything else, because the same applied heat has more or less mass to move.
- How dry they are. Cured or freshly harvested, how long you have had them, and how they were stored. Moisture governs the first half of the roast.
- The equipment state. Drum size, vane spec, and how long the grill soaked at temperature before you charged. Metal that has been hot for twenty minutes behaves differently from metal that hit the setpoint thirty seconds ago.
- Ambient conditions. This is an outdoor grill. Air temperature and wind are real variables and a cold windy afternoon is a different roast.
- Charge temperature and the turning point. Product temperature drops when cold nuts hit a hot drum, then bottoms out and begins to climb. Where it bottoms and when it turns tells you a lot about the batch.
- The curve. Product temperature at each minute, or the saved graph.
- Every gas change, with its time. A profile you cannot reproduce because you cannot remember when you eased off is not a profile.
- Pull temperature and total time.
- How you cooled and how long it took. This belongs in the profile, for reasons in cooling roasted nuts.
- One line of tasting note, written the next day when they are cold, and one line saying what you would change.
