Description
Mechanical shear forces partially rupture starch granules while inducing polymer alignment, creating a viscoelastic network.
Technical
Repeated impact forces from wooden pestles (typically iroko or odum wood) cause localized starch gelatinization through frictional heating (45-60°C). Concurrently, amylopectin chains align into pseudo-crystalline structures stabilized by hydrogen bonding with residual moisture (30-40% water content).
Culinary Significance
Transforms dense, fibrous tubers into a smooth dough with unique stretchability ideal for scooping soups and stews.
Science
Primary Reaction
Shear-induced starch gelatinization
Parameters
Temperature
52°C optimal
45°C to 60°C range
Time
30-45 minutes
15 minutes (small batch) – 2 hours (ceremonial quantities)
Equipment
Wooden mortar (50-70cm diameter)Pestle (1.2-1.8m length)Damp cloth (for moisture control)