There's a certain point every year in Atlanta when you step outside in the morning and realize you don't immediately regret leaving the air conditioning. The humidity finally starts to let up, there's a little chill in the air, and suddenly that first hot cup of coffee sounds even better than usual.
As someone who spends a good portion of his life roasting coffee, I look forward to this time of year. Not just because standing next to a coffee roaster becomes a little more pleasant, but because fall is an interesting season for exploring flavor.
We tend to associate autumn with cinnamon, nutmeg, maple, toasted nuts, and caramel. But what makes these flavors work so well with coffee? And does coffee actually taste different when the weather changes?
The answer involves a little chemistry, a little sensory science, and quite a bit of what happens inside the roasting drum.
Temperature Changes More Than You Think
Let's start with an important distinction: coffee doesn't know it's October.
A properly roasted and brewed coffee doesn't suddenly develop new flavor compounds because the temperature outside drops twenty degrees. But the temperature of the coffee itself can have a significant effect on how we experience its flavor.
Coffee contains hundreds of aromatic compounds, many of which are created or transformed during roasting. When hot coffee sits in your cup, some of these compounds evaporate and travel toward your nose. That's a big part of what you're experiencing when you smell freshly brewed coffee.
As coffee cools, the release of those aromatic compounds changes. So does our perception of its acidity, sweetness, bitterness, and roasted characteristics.
You can actually test this yourself!
Take a sip of freshly brewed coffee once it's cool enough to drink comfortably, then let it sit for several minutes and taste it again. You may notice that certain flavors become more apparent while others seem to fade.
The coffee hasn't been replaced. You're simply experiencing it at a different temperature.
And that's one reason I encourage people not to judge a coffee by its very first sip.
Why Coffee Already Contains So Many Fall Flavors
Here's something that surprises a lot of people: when we describe a coffee as having notes of chocolate, caramel, or toasted nuts, that doesn't mean we've added those ingredients.
Those characteristics can develop naturally during roasting.
Green coffee beans contain sugars, amino acids, organic acids, and numerous other compounds. As heat is applied during roasting, a series of chemical reactions transforms those compounds into the flavors and aromas we associate with coffee.
One of the most important is the Maillard reaction, the same broad category of reactions responsible for the browned crust on bread and many of the savory, toasted aromas in cooked food.
Caramelization and the thermal breakdown of sugars also play roles in developing coffee's flavor, although the chemistry is considerably more complicated than simply turning sugar into caramel.
As a roaster, my job is to manage those reactions through heat, time, and airflow.
Roast too lightly for a particular coffee, and some of the flavors we're looking for may not fully develop. Push it too far, and excessive bitterness and smoky characteristics can begin to overwhelm the bean's natural complexity.
The goal is balance.
That's particularly relevant in the fall because many of the flavors people associate with the season are already present in well-roasted coffee.
Our Morningside Blend, for example, has notes of hazelnut, cocoa, and citrus. Our San Francisco Blend has a milk chocolate and caramel character. Those aren't seasonal additions. They're part of what makes the coffees themselves interesting year-round.
Fall just gives us another reason to pay attention to them.
Why Cinnamon, Maple, and Apple Work With Coffee
We here at San Francisco Coffee Roasting Company believe you should drink coffee the way you like it. But, personally, in my opinion, not every flavor belongs in a cup of coffee. Some ingredients complement what's already happening in the beans, while others can overpower the coffee entirely.
Take cinnamon.
Cinnamon gets much of its recognizable aroma from a compound called cinnamaldehyde. Its warm, sweet-spicy character can complement the toasted and nutty notes developed during roasting.
By NEUROtiker - Own work, Public Domain
Maple brings a different set of characteristics. Its rich sweetness and caramel-like aroma can work particularly well with coffees that have chocolate, brown sugar, or toasted-nut notes.
Apple is interesting for another reason.
Coffee has its own natural acidity, which can come across as bright, citrusy, or fruit-like depending on the bean, roast, and brewing method. Apple flavors can work with that acidity, creating a combination that feels lively rather than simply sweet.
Shaken Apple Crisp
Banana might seem like an unusual pairing for coffee, but its natural sweetness and creamy character work surprisingly well with coffee's roasted, chocolatey, and nutty notes. And when you bring in the caramelized sugar and warm spices associated with our Bananas Foster, you're building on flavors that are already present in the coffee itself, rather than covering them up.
That's also why balance matters so much when developing a seasonal drink.
Adding more syrup doesn't necessarily make a drink better. At a certain point, you're no longer tasting the coffee. You're tasting whatever you've added to it.
A good flavored coffee drink should still taste like coffee.
The Difference Between Flavor and Sweetness
One thing I always find worth explaining is that flavor and sweetness aren't the same thing.
A coffee can have notes of chocolate without containing chocolate, or remind you of caramel without having any added sugar.
Aromas are a major part of how we recognize these flavors. Your nose detects aromatic compounds, while your tongue responds to basic tastes such as sweetness, acidity, and bitterness. Your brain combines those sensations into what we experience as flavor.
That distinction is especially important with fall drinks.
Cinnamon, nutmeg, and cloves are aromatic spices. They can create the impression of sweetness and warmth even though the spices themselves aren't necessarily sweet.
That means a well-balanced drink doesn't need to rely entirely on sugar to deliver a satisfying seasonal flavor.
Sometimes the most interesting thing you can do is use a little less sweetness and allow the coffee's natural characteristics to come forward.
Does Fall Change the Way We Experience Coffee?
There's one more piece of the puzzle, and it has less to do with the coffee itself than with the person drinking it.
Our enjoyment of food and beverages isn't determined by chemistry alone. Temperature, aroma, expectations, and environment all influence the experience.
Think about drinking a hot cup of coffee on a ninety-degree August afternoon compared with drinking that same cup on a crisp October morning.
The coffee might be identical, but your experience of it probably won't be.
In cooler weather, the physical warmth of a cup becomes part of the appeal. Familiar aromas like cinnamon and toasted nuts also carry associations with seasonal foods and traditions.
That doesn't mean our taste buds automatically become more sensitive to fall flavors when the leaves change. It means flavor is a combination of sensory information, temperature, and context.
And sometimes context makes all the difference.
A Good Season to Pay Attention to Your Coffee
My suggestion this fall is simple: take a little time to notice what's actually in your cup.
Try a coffee you've had before and see whether you can identify some of its natural flavor characteristics. Pay attention to how those characteristics change as the coffee cools. If you're ordering a seasonal drink, notice how the added ingredients interact with the espresso rather than simply how sweet the finished drink tastes.
There's a lot happening in a cup of coffee, even before you add the cinnamon.
We've been roasting coffee here in Atlanta for more than thirty years, and one of the things I still enjoy most about the process is that there's always something new to notice.
That's true whether you're drinking a carefully brewed black coffee, a cappuccino, or something with a little maple and spice.
And if Atlanta decides to give us a few actual fall afternoons this year, all the better.