For every beginner select beans to buy is arduous matter, especially when you are trying to make espresso. Since pulling a shot of espresso relates to all proccess of making it, from grind the beans to serve with perfection. So yes, beans have a significant role in your (good) espresso cup.
Then, how do we know that we are using the best espresso beans into our coffee grinder? By the way, before talking which one is better, and which one you shall not use in espresso, let’s talk about bean classification first. To make it simple, there are three type of beans: Milds, Brazils, and Robustas. Milds are arabica beans from plant grown at high altitudes, they have sweet, strong aroma and flavor. Brazils are the opposite, they grown in low altitudes. They are not as good as the milds, but yeah, they are cheaper than it. Lastly, robustas are what we called as “ordinary coffee”, since most of instant coffees out there used robustas as their main ingredient. They come from the inferior robusta plants.
From bean classification above, it’s surely clear that milds (pure arabica) are the best beans to use in espresso shot. Their sweet, strong aroma will useful especially when milk started to mix into a blend. Brazils come in as second option to use in espresso. Though, your espresso will not as good as the milds one. Robustas? Nah, never ever think to use them in your espresso. They are flavorless and aromaless.
Sadly, you will not find any best espresso beans in the grocery store. Most of them are sold in local merchant or local roaster, so you can purchase really fresh roasted bean. Ah, don’t be that sad. Some merchant or store offer their beans online now. Even there are many website out there selling a good quality beans like Brazil Yellow Bourbon, Sumatra Lake Tawar or Ethiopian Natural, and ready to deliver it to your address world wide. GoCoffeeGo, Illy, CoffeeForLess.com are some example of those websites.