There’s just way too much to know about wine! We could go on for ages just talking about where to store it, how it’s harvested, and (of course) what to pair it with. Alas, we wine nerds love the unknowable nature of the humble wine grape. That’s why, today, we’re delving into some totally brainy territory. That is to say: “How does oak, concrete, or steel fermentation vessels transform what we taste in the glass? Sounds like a complicated question, but we promise you it’s not. We even have “Professor” Ryan Render, winemaker/owner at Rendarrio Vineyards to help with the specifics. You’ll do great. You always were teacher’s pet!
From Juice to Alcohol
First things first: Every wine undergoes fermentation, the process that turns fresh grape juice into the beginnings of a delicious alcoholic beverage. In technical terms, fermentation is a metabolic process that converts sugar to alcohol (and boy is it fun to watch those bubbles 
appear in the tank). You probably already know this (gold stars for you). However did know that there are often not one but two fermentation processes in some of your favorite wines? Fermentation isn’t a one-size-fits-all process by any means. Your wine might be first fermented in one vessel (say, steel) for bright clarity then fermented a second time in a specific variety of oak, adding just a touch of toastiness on the nose. After that, the wine can be aged in a multitude of materials, adding (or subtracting) from the wine’s overall flavor. Whether you prefer minimalistic wines or a heavy oaky finish, you’ll want to know the what, when, where,and why of fermentation. Trust us.
Professor Render says: “Whether or not a winemaker chooses one type of fermentation vessel over another really comes down to their specific winemaking philosophy.”
Extra Credit: Head out to Rendarrio Vineyards this fall and ask all the questions you desire. Check out the newly expanded tasting room, reserve tastings, and harvest events.
Mapping and Directions: speedfind.com/Rendarrio
Oak: A Classic Take
You know oak—it’s one of the most familiar wine descriptors out there, and there’s a reason for that. You can taste it when you sip a big, flavorful Cabernet Sauvignon or a classic Chardonnay that’s seen an oak fermentation or aging process. That’s because oak offers up savory counterpoints to the fruit at hand (this is why
oak is often described as nutty or caramel-esque). Oak may be a common method for both fermentation and aging, but not all oak tastes the same. French oak often produces a stronger floral scent and rich, vanilla flavor, while Hungarian oak offers up a more neutral experience that lets the fruit stand more on its own. Different wood types also boast varying pore sizes, which can impart more or less tannic structure into a particular fermenting wine. If you were to look under a microscope, you’d see that American oak has a higher density and more carbohydrates, which can create sweet, spicy or nutmeg flavors. Moral of the story: Don’t stop at simply “oak.” Always ask, “What kind?” and “why?”
Professor Render says: “A lot of winemakers have gone back to oak 
fermentation for red wines to soften the tannins and create more color and stability.”
Extra Credit: Four Lanterns 2014 Firelight Syrah: Can you taste the savory, oaky nose on this luscious red, described by Wine Enthusiast as boasting “strong pepper notes, elderberries, sesame, and smoked meat?”
Mapping and Directions: speedfind.com/FourLanternsWinery
To Ferment in Cement?
Ever heard of a cement egg? No? You’re not alone. However, it is true that the trend toward using large, concrete spheres is soaring in popularity again. Why ferment in cement? Well, the material remains cool, and maintains a very consistent temperature. This is great news for delicate whites like Sauvignon Blanc and Viognier that are often picked during the
coolest hours of the day to maintain balance within the fruit. Concrete is also porous, and unlike stainless steel (which does not allow for micro-oxidization) wine that is fermented in cement eggs receive just the right amount of air while transforming from juice to alcohol. The coolest part, according to many winemakers lies in the egg’s ability to get “out of the way” of Mother Nature. Depending on t
he wine grape, you may taste more of the fruit’s natural flavor—and, as a result—get closer to the vineyard it once called home.
Extra Credit: 2014 Sculpterra Sauvignon Blanc: Can you taste how this refreshing white holds nothing back when it comes to its citrus, melon, and honeydew fruit appeal?
Mapping and Directions: speedfind.com/SculpterraWinery
Stainless Steel: Not Just for Appliances
Stainless steel tanks aren’t just flashy and beautiful on the crush pad: they’re also incredibly useful workhorses that allow many winemakers to keep fermentation neutral. Greater control over the flavors imparted during fermentation = more fun when it comes to aging. That means fresh fruit flavors shine without added distraction, creating a truly clean slate. Many modern Chardonnay producers, for example, are turning away from oak fermentation to stainless steel fermentation, making for a truly crisp, bright wine u
nmatched in its refreshing drinkability.
Extra Credit: 2014 Sextant CC Chardonnay: Sip this fresh, citrusy Chardonnay and experience why it was fermented din 90 percent stainless steel. Can you taste the two vineyards used—Monterey County and Edna Valley?
Mapping and Directions to Paso Robles tasting room: speedfind.com/SextantWines
Mapping and Directions to SLO tasting room: speedfind.com/Sextant
This blog was written by Hayley Thomas, food and wine writer for SLO New Times and PasoRoblesWineries.net. You can reach her at hthomas@newtimesslo.com or follow her on instagram @flavorslo.
If you’re looking for a place to spend the night in Paso Robles, checkout:
The Adelaide Inn is an iconic, locally owned hotel known for its friendly staff and lush landscaping. With spacious rooms and a convenient location close to highway 101 and the event center – home of the California Mid-State Fair – this hotel is a great choice for most travelers.
Directions: speedfind.com/AdelaideInn
L
a Bellasera Hotel & Suites is an elegant boutique hotel nestled in the heart of Central Coast Wine Country. Influenced by Mediterranean and Italian architecture, the luxurious accommodations reflect the aged sophistication of the Central Coast region and the relaxed nature of the California countryside.
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Experience the pristine countryside of Paso Robles Wine Country at Lekai Ranch. Lounge on the porch of your private suite and lose yourself in the tranquility and stunning views of the vineyards and oak studded hills beyond. This vacation rental is located just minutes from some of the most distinguished wineries and a premier olive oil estate, and only 15 minutes from downtown Paso Robles’ restaurants, wineries and shopping.
Directions: speedfind.com/Lekai | vrbo.com/701796
Enjoy the elegance, style and natural beauty of California’s Central Coast at the JUST Inn®. Surrounded by vineyards, our JUST Inn Suites offer luxurious appointments like fireplaces, Tempur-Pedic®mattresses, Frette linens, hydro-spa tubs, and range in size from 600–1,200 square feet.. An overnight stay includes breakfast and a tour of the winery and caves.
Directions: speedfind.com/JustinWine