| 摘要 |
<p>The coffee is produced by (a) slowly freezing the lower portion of a layer of aqueous coffee extract while leaving the upper portion not completely frozen; (b) instantly freezing the upper portion by spraying a cryogenic fluid, preferably liquefied nitrogen, on to it; and (c) freeze-drying and grinding (in either order) the frozen coffee extract. The combination of slow and fast freezing gives a frozen coffee extract comprising dark and light layers, giving on grinding, particles of different colours, which when mixed, simulate the appearance of roast and ground coffee.</p> |
