International Cuisine & Flavors Flashcards

In Korean doenjang (fermented soybean paste), which compounds produced by Aspergillus oryzae are chiefly responsible for its umami depth distinct from Japanese miso?

Answer: Free glutamic acid and peptides from extensive protease activity

Aspergillus proteases extensively hydrolyze soy proteins during doenjang fermentation, releasing free glutamate and umami-active peptides in higher concentrations than most Japanese misos.

The use of dried limes (loomi) in Persian and Gulf cuisine contributes which primary flavor chemistry distinct from fresh citrus?

Answer: Maillard-derived furanic compounds plus concentrated citrate and fermentation acids from drying

Oven-drying limes drives Maillard reactions producing furanones, while concentrating citric acid and generating fermentation-derived acids that create a tart, earthy, complex profile absent in fresh citrus.

What is the critical role of 'mother' starter (levain) in sourdough rye bread traditional to Northern European cuisines like German Roggenbrot?

Answer: It acidifies the dough sufficiently to inactivate rye amylases and allow starch gelatinization during baking

Rye's active amylases would degrade starch during baking; sourdough acid lowers pH below amylase optimum (~pH 4.5) so starch can gelatinize and set the crumb.

In Cantonese wok cooking, 'wok hei' (breath of the wok) flavor is primarily attributed to which chemical reaction driven by extreme heat?

Answer: Lipid oxidation generating aldehydes and alkenals from polyunsaturated fatty acid pyrolysis

Extreme wok temperatures (>300°C) cause rapid pyrolysis of polyunsaturated fatty acids, generating reactive aldehydes like 2-alkenals that define wok hei aroma.

Why does traditional Mexican chocolate (used in mole) undergo stone-grinding with sugar and cinnamon rather than conching, resulting in a grainier texture than European chocolate?

Answer: Conching was never adopted because sugar crystals are intentionally left large to provide textural contrast in sauce-based applications

Traditional Mexican chocolate is not intended for eating as a bar but for dissolving into sauces and drinks, where residual sugar crystal texture is acceptable and conching's fat migration benefits are unnecessary.

In the Maillard chemistry of coffee roasting, which intermediate compound class bridges early amino acid-sugar reactions to the final roasted flavor volatiles?

Answer: Amadori rearrangement products (N-substituted glycosylamines)

Amadori products form from the initial condensation of amino acids and reducing sugars and subsequently fragment and rearrange into the hundreds of volatile roasted flavor compounds found in finished coffee.

The characteristic gelatinous texture of Vietnamese pho broth achieved through long simmering of beef bones is primarily due to the conversion of which structural protein?

Answer: Collagen to gelatin via hydrothermal hydrolysis of triple-helix hydrogen bonds

Prolonged simmering at near-boiling temperatures hydrolyzes the triple-helix hydrogen bonds of collagen, releasing gelatin molecules that give pho its characteristic body and mouthfeel.