The Complete Handbook of Nut Butters

Chapter 1: Understanding Nut Butters

Nut butters are not a single product. They are a category defined by the behavior of crushed oilseeds, and that behavior varies dramatically depending on the nut, the processing method, and the environmental conditions. A jar of smooth peanut butter from a grocery store shelf and a batch of freshly ground macadamia butter in a restaurant kitchen have little in common beyond the fact that both are emulsified pastes of nut solids and oils. To work with them professionally, you need to understand what is happening at the physical and chemical level. That understanding is not academic; it is the difference between a clean batch and a costly waste of ingredients.

At its core, a nut butter is a suspension of solid particles in a continuous oil phase. When you grind a nut, you are crushing the cellular structure, releasing the oils (primarily triglycerides) and breaking down the solid cell wall material into fine particles. The resulting paste is a two-phase system. The oil is the liquid that flows, and the solid pieces are what you taste as texture. The stability of this system - how well the solids stay suspended and how evenly the oil is distributed - is governed by a few fundamental factors: particle size, particle size distribution, moisture content, and temperature.

Let's start with particle size. Consider a coarse peanut butter with visible chunks versus a smooth, spreadable variety. The coarser version has particles that are, on average, tens of microns