400次咖啡的科學

疫情下,個個係屋企悶到傻,由即溶咖啡玩到去攞真咖啡玩,比我爆一句:「唔好嘥靚豆攪d咁嘅嘢!」。
首先,真咖啡係做唔到咁靚,一定要即溶。“打”咖啡變泡,係要有特別物質去hold住空氣,即溶咖啡先有呢種特性。上網揾點解,有外國網友話因為即溶咖啡加咗半乳甘露聚醣(Galactomannan, 簡稱GM) 嘅穩定劑。個腦閃一閃,呢個字喺讀roasting science時見過。攞本封咗塵嘅書出嚟睇,確定咖啡豆本身已經有。
即溶制作仔細配方都係商業秘密下,我唔能夠確定係咪外加咗GM。我會假設係當用咁少水去開即溶粉,咖啡本身嘅天然GM對水比例,已經係會異常地高,唔須要外加都夠“力”去hold到咁多空氣。
亦因為咖啡本身有GM下,所以當攞真咖啡去打時,係會有少少泡。GM亦係做espresso時,果層crema嘅其中一位功臣。
小知識:呢個玩法,並唔係出自韓國。其實係印度同巴基斯坦一帶流行咗好多年嘅街頭飲品,當地人叫Phitti Hui Coffee/Indian espresso。
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