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Whisk milk, yolk and rennet in a saucepan to combine, then stir occasionally over medium heat until mixture is just hot to touch (41-48C, 5-7 minutes; be careful not to overheat the mixture or it will curdle). Set aside in a warm place until curd sets (30-40 minutes), then cut into rough 10cm cubes with a knife. Scatter sugar along the cuts (be careful not to cover the curd with sugar and weigh the curd down), heat over very low heat until curd sets and sugar dissolves (1½ hours), then cool to room temperature.