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Introduction to Home Coffee Roasting

To enjoy fresh, home-roasted coffee beans and the wonderful aroma of coffee, nothing beats roasting your own beans. Along the way you will discover many other flavors in coffee and learn to tell the differences in origin, altitude, variety, processing method, and roasting technique. All of this will deepen your understanding of coffee.

Before you start home roasting, there are a few essentials you need. Remember, though, that some items may not be listed here and may be hard to buy. That is why you need all five senses to guide your roasting. Everything else can be ordered online. Let's get started.

1. A Simple Roasting Machine

There are several options depending on your budget and the features you want. Some people use popcorn poppers or even pans, which are cheaper but do not let you control roasting variables or watch how the beans react to heat. When you decide to get serious about roasting, you can upgrade your equipment.

If you want a more practical machine, choose a home roaster that lets you control temperature, time, and other variables.

Take the Behmor 1600Plus as an example. It is affordable for most people and can roast one pound at a time. You can set parameters for specific beans or override the factory settings, and it also has a smoke exhaust function. Because the machine is designed for coffee rather than popcorn, it has a built-in automatic cooling system and a drum that ensures even roasting.

2. Green Coffee Beans

What you need for roasting is green coffee, but it is important to know that green beans vary. Once you start roasting at home, you will notice differences in region, variety, production history, processing method, and even flavor description, all of which affect roasting.

Coffee bean density, for instance, is influenced by many factors, the easiest to measure being growing altitude. Denser beans tend to have better flavor, and because their high density affects how they absorb heat, roasting at too low a temperature can produce baked flavors. Roasting soft, low-density beans at too high a temperature, on the other hand, will scorch them.

Many books and websites cover this topic, and some home roasters share setting guides, so you can easily find roasting references to follow.

3. A Scale

A scale is indispensable for brewing, so if you do not own one, get one soon. You can use it to weigh green beans and roasted beans, which tells you how much coffee you roasted and how much water weight the beans lost during roasting.

4. A Cooling Tray or Sieve

If your roaster does not have a cooling tray, you will need one. When the beans finish roasting, their core temperature is still extremely high, so it is crucial to bring the internal temperature down as quickly as possible.

Some home roasters include a cooling tray for this step, but if you do not have one, buy a tray or a sieve. It may not be the ideal tool, but it is perfectly acceptable and is part of producing a perfect batch of coffee beans.

5. Coffee Bags or Airtight Containers

After cooling, you must let the gases released by the beans escape. Opinions differ on how long this takes: Sweet Maria's suggests 8-12 hours, while others say 24 hours or even longer.

Storage also affects shelf life, so store your beans properly. Bags with one-way valves are recommended because they block light, moisture, heat, and air. Reusable airtight containers are another good option. Make sure the container is in good condition and blocks light, or your beans will deteriorate quickly.

6. Keep Roasting Records and Notes

Want your coffee to taste consistent every time? Or want to work out why you are getting unpleasant flavors or defects and how to fix them? Then you must keep roasting records. You can use the same beans, the same machine, and the same roasting parameters each time, but some parameters can only be controlled and repeated if you write them down.

How to Roast Coffee Beans at Home

1. Net Roasting

This is a home roasting method developed in Japan and is also the most commonly used method in Korea.

Steps:

1. Place green coffee beans in a net and heat it on a gas stove.
2. Keep shaking the net so the green beans roast evenly.
3. When the first crack occurs, silver skin will start flying around. At this point you can gently blow on it or lightly tap the net with a rice spoon.
4. When the second crack occurs, roast to your desired degree, then turn off the heat. Shake the net over the sink to clean off any remaining silver skin, then let the beans cool.

2. Oven Roasting

Steps:

1. Preheat the oven to 270°F.
2. Spread all the coffee beans in a single layer on a baking sheet, making sure each bean touches the surface of the pan.
3. Watch the color continuously and roast to your desired level. The total time should not exceed 15 minutes.
4. When the desired color is reached, remove the beans quickly and place them in a net, shaking to remove the silver skin and cool them.

3. Mini Rice Cooker Roasting

The rice cooker here does not mean the multifunctional models on the market, but a simple cooker that only cooks rice.

1. Press the button to preheat.
2. When the rice cooker reaches a certain temperature, add the coffee beans.
3. Wear heat-resistant gloves and hold the lid and handle to shake.
4. After the first and second cracks, silver skin will start popping off and smoke will emerge.
5. Because the lid is transparent, you can watch the roasting directly. Stop roasting when the right degree is reached.

Roasting Degrees

For your first home roasting, you may not know how the roasting degrees correspond to time. Here is a small template for reference. These are not strict rules, so feel free to experiment and find what works for you.

Light Roast

Roast for about 7 minutes. When the green coffee beans start to shed their husks and expand to double their size, you are approaching the light roast level. The surface of the beans tends to be dry, and the flavors lean toward light acidity and grassy notes.

Medium Roast

After about 9-11 minutes, the coffee starts to give off sweet flavors with a balanced touch of acidity. This is the most popular American roast degree, suitable for drip coffee.

Medium-Dark Roast

Roast for about 12-13 minutes. The coffee begins to develop a sheen, giving off some spicy notes and a rich, chocolate-like sweetness. Suitable for European-style French press coffee or espresso blends.

Dark Roast

After about 14-15 minutes, when smoke appears, the green coffee beans will also exude oil, undergoing caramelization and giving off smoky flavors.

Home roasting is a rewarding experience that can transform your relationship with coffee and might even become your new business. So if roasting interests you, gather the items listed here, find data or recorded procedures from friends who have done it before for your first attempt, and experience roasting for yourself.

FrontStreet Coffee Recommendation

If home roasting has you leaning toward a balanced medium roast, FrontStreet Coffee is a convenient place to start. Their Brazil Queen Estate coffee, a Yellow Bourbon from the world's largest coffee-producing country, is roasted to a medium level that draws out creamy peanut, chocolate, toast, and sugarcane sweetness, and it works equally well as a pour-over, moka pot, or espresso. For something sweeter and more fruit-forward, the Strawberry Candy Geisha blend pairs Costa Rican honey-processed coffee with Panamanian washed Geisha for a rounded, honeyed cup.