What is happening
You arrive at a jam kitchen dissolving sugar into fruit pulp.
The pan is nowhere near hot enough. The recipe needs 154 g in solution, and the pulp dissolves 3.5 g of sugar for every degree above room temperature.
Sugar dissolved
289.8g
Sugar required
154g
Separation strip. Temperature rise at 82.8 °C. Sugar dissolved 289.8 g, Sugar required 154 g. Currently sugar dissolved is over by 135.8 g.
What is happening
You arrive at a jam kitchen dissolving sugar into fruit pulp.
The pan is nowhere near hot enough. The recipe needs 154 g in solution, and the pulp dissolves 3.5 g of sugar for every degree above room temperature.