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1
Combine the wheat flour, mashed banana, ground cardamom, and milk in a bowl and work to a smooth, pourable batter — thick enough to hold briefly on a spoon before dropping in a slow, continuous ribbon, approximately the consistency of pancake batter. Rest the batter for 10 minutes so the flour fully hydrates and any raw, grainy edge disappears from the taste. The finished batter should fall from the spoon in one unbroken stream, neither clumping nor running away like water.
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2
Prepare the syrup by dissolving the sugar in the water over moderate heat, then bringing it to a boil and cooking until one-string consistency is reached — a small amount drawn between thumb and forefinger forms a single, unbroken thread. Draw the test slowly and let the thread extend fully, because a thread that snaps at once means the syrup still needs another minute. Hold the syrup warm throughout service so it stays fluid enough to penetrate the malpua the moment it leaves the oil; too thin and the malpua softens to sogginess, too thick and it caramelises against the fried surface.
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3
Heat the oil in a wide, deep pan to 170 °C, then lower one ladleful of batter gently into the centre so the batter spreads of its own accord into a roughly circular shape with a naturally lacey edge — frying one malpua at a time keeps the oil temperature steady, because each addition of cold batter pulls the heat down and a crowded pan never recovers quickly enough. At temperature below 170 °C the malpua drinks oil and turns heavy; above it, the exterior chars before the soft interior cooks through. The malpua is ready when the edges are golden and visibly crisp and the surface has set to a pale gold.
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4
Lift the malpua immediately from the oil and transfer it directly to the warm syrup, pressing gently to submerge so the syrup enters the interior while the surface is still open and porous from the heat. The syrup must be warm throughout this step — cold syrup sets the fried surface into a shell and prevents penetration, leaving the centre dry. Allow the malpua to soak for 1–2 minutes; the edges remain slightly crisp while the centre yields and swells with syrup.
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5
Remove from the syrup and plate. Serve immediately alongside chilled rabri, in the Rajasthani tradition, so that the contrast between the hot, syrup-laden malpua and the cold reduced milk is felt in the same mouthful — that opposition of temperature and texture is the defining sensory experience of this presentation.