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1
Bring the milk to a bare simmer in a heavy saucepan over medium heat, stirring to prevent scorching. Remove from heat and add the lemon juice in a slow stream, stirring gently, so the acid meets the milk evenly and produces a clean split into pale yellow whey and soft white curds rather than ragged, rubbery lumps. The whey should run nearly clear — if it is still milky, return to very low heat for thirty seconds and add a few drops more acid.
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2
Line a colander with two layers of muslin, pour the curds and whey through, then gather the muslin and rinse the chhena under cold running water so the residual acidity is washed away and the finished sandesh carries no sour edge. Twist the bundle firmly and hang it for 20 minutes to drain. Unwrap: a handful of chhena pressed between the palms should hold its shape cleanly and leave no wet mark on the skin — it must feel like soft modelling clay, not wet dough, not crumble.
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3
Turn the drained chhena onto a clean surface and add the caster sugar (or grated nolen gur for the winter variant). Work the mixture with the heel of the hand for 2 minutes so the sugar begins to dissolve into the chhena, releasing just enough moisture to give a smooth, even texture once cooked. Rest 5 minutes to allow partial dissolution before transferring to the heat.
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4
Transfer the chhena-sugar mixture to a non-stick pan set over the lowest possible heat and stir and fold continuously with a spatula, pressing the mixture against the base and sides without pause, so the heat moves through evenly and no part of the mixture sits still long enough to colour. This is where the dish lives or dies: any rise in heat, or any moment of inattention, will caramelise the milk sugars, producing a grainy, golden result rather than the required ivory-white, fudge-like confection. Cook until the mixture pulls cleanly away from the sides and base of the pan and appears glossy and slightly dry at the surface.
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5
Add the ground cardamom in the final minute of cooking and fold through so the heat blooms its fragrance into the mixture without driving it off entirely. Turn the sandesh onto a plate — it should be cohesive, not wet — and leave it uncovered at room temperature until completely cold, because the mixture is too soft to hold a mould while warm and will firm to the correct consistency only as it sets.
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6
Portion the cooled sandesh into 16 equal pieces. Press each into a traditional wooden sandesh mould or shape by hand into rounds or flattened discs, working with a confident, single press so the surface takes a clean impression. The finished piece should hold a clean edge and yield with gentle pressure — melt-on-the-tongue texture is the measuring stick of quality.