Reference point
Break a loaf just out of the oven in two and smell the crumb inside.
Do this before you read on. An entry only works when you have just smelled the thing.
Sweet, warm, with a yeasty note and a lightly scorched crust. Crust and crumb give two different smells and should be smelled separately.
The crust carries the compounds of the reaction between sugars and amino acids at high heat — the same group found in scorched rice crust and roasted coffee. The crumb carries the compounds of yeast and dough fermentation, closer to fermented sticky rice.
A loaf of bread therefore holds two scent families in one object, a few millimetres apart.
How to smell it
Break the loaf while it is still hot. Smell the crumb first, then the crust. Write two words for each. It is the best exercise in the dictionary on how one object can hold two distinct smells.
Why this one is hard
Because people smell the whole loaf and get a merged impression. You have to break it and smell each part separately.
Don’t confuse with
This entry
Fresh-baked bread
Gourmand family
Bread has a Maillard crust formed above 140 degrees, so it has a roasted note; sticky rice only reaches 100 degrees, so it has only 2-acetyl-1-pyrroline and no roasted layer at all.
Scientific note
The crust carries the products of the Maillard reaction above 140 degrees, while the crumb reaches only about 98 degrees and keeps the compounds of dough fermentation intact: ethanol, esters and organic acids. Two temperature zones a few millimetres apart produce two entirely different sets of compounds in the same loaf.
In Vietnamese life
Vietnamese bánh mì adds rice flour, so its crust is thinner and crisper and its crumb airier than a French baguette. That difference in structure also shifts the balance between the smell of the crust and the smell of the crumb.