How to Make Non-Bitter Blended Coffee with Eggs and Peanuts

If you’ve ever taken a sip of traditional dark-roast coffee and winced at the bitterness, you’re not alone. Many coffee drinkers—especially those new to the brew—find the strong, astringent taste off-putting. But what if there were a way to enjoy coffee without that harsh edge? In China, where coffee was once a rare and costly luxury, innovators developed a blended coffee formula that minimizes bitterness while adding richness and approachability. This method, using simple ingredients like eggs, peanuts, and sugar, produces a smoother, more palatable cup without expensive equipment.

The optimal formula from the study uses 200g of Catimor coffee beans roasted with 18g peanuts, 1g salt, 16g egg, and 50g sugar, then blended with 35g coffee powder, 25g milk powder, and 40g sugar for the final cup. This combination delivers a balanced, flavorful brew with reduced bitterness.

Why Traditional Coffee Can Taste Bitter

Most coffee’s bitterness comes from its natural compounds—especially chlorogenic acids and caffeine—and the way it’s roasted and brewed. Dark roasts amplify these bitter elements, and without milk or sweetener, the taste can be overwhelming. In China, where coffee culture developed later and access to premium beans was limited, many people found straight black coffee too harsh. That led to experiments with blending, aiming to smooth out the flavor while keeping costs and equipment needs low.

How Blending Reduces Bitterness

Blending coffee with other ingredients changes both the flavor profile and the perception of bitterness. The Chinese study focused on adding peanuts, eggs, sugar, and milk powder to roasted Catimor beans. During roasting, sugars caramelize, proteins denature, and fats release aromatic compounds. The egg coagulates, contributing to texture and masking bitterness, while peanuts add a nutty depth. Sugar balances acidity and rounds out sharp edges. Together, these ingredients create a more rounded, less astringent cup.

The Science Behind the Roast Formula

The researchers used a Catimor coffee variety (a high-yield, disease-resistant hybrid common in China) and conducted a four-factor orthogonal test to determine the ideal ratios of non-coffee ingredients. The variables were: peanuts (A), salt (B), egg (C), and sugar (D). After analyzing variance, the optimal formula was A3B3C4D3—18g peanuts, 1g salt, 16g egg, and 50g sugar added during the 55-minute roasting process. This combination produced a rich, aromatic, and noticeably less bitter coffee base.

The roasting process itself took about 55 minutes total: 25 minutes to reach a light brown, 9 minutes with added salt and peanuts (until the peanuts yellowed), 11 minutes with the whisked egg (until the mix turned brown), and 10 minutes with gradually added sugar (until the coating was non-sticky). Throughout, a fan helped remove chaff (silver skin), ensuring even roasting and flavor development.

The Final Flavor Blend: Coffee, Milk, and Sugar

After roasting, the beans were cooled, ground through a 40-mesh sieve, and mixed with powdered ingredients. The final blend tested 9 variations using 100g total of powdered components. Twenty tasters rated these combinations, and the highest-scoring formula was E3F2H1: 35g of the specially roasted coffee powder, 25g of full-fat milk powder, and 40g of sugar. This mix delivered a pleasant balance—sweet, creamy, with a rounded coffee flavor and minimal bitterness. The resulting powder had a shelf-stable, free-flowing texture with almost no clumps or moisture issues.

Sensory evaluations noted a brown-and-white color mix, a long-lasting coffee and faint milk aroma, sweet and mellow taste with low bitterness, and a powder texture free of hard lumps. Microbiological tests confirmed no harmful pathogens or spoilage.

How to Reproduce the Recipe at Home

You can recreate this non-bitter blended coffee using basic kitchen tools: a stainless steel wok, a regular grinder, a 40-mesh sieve, an electric fan, an electric stove, and a whisk or mixer. Start with 200g of Catimor or another single-origin coffee bean (preferably light to medium roast), then follow these steps:

• Select 1st–2nd grade beans, free of mold or odor.
• Rinse beans to remove dust, then dry them.
• Roast the beans until they turn yellow and shed silver skin; use a fan to blow off the chaff. Continue roasting until light brown (about 25 minutes).
• Add 1g salt and 18g peanuts, roasting until the peanuts yellow (around 9 minutes), using the fan to remove more chaff.
• Add 16g of whisked egg (shell removed, beaten to foam) and roast until the mix turns brown (about 11 minutes).
• Slowly add 50g sugar while stirring continuously until melted. Turn off heat and let residual heat roast the mixture until the sugar coating is non-sticky (about 10 minutes).
• Once fully cooled, grind the beans, sieve through a 40-mesh screen, and regrind any oversized particles. Discard any remaining fine residue (less than 0.1% of original weight), and mix the usable powder evenly.
• Combine 35g of this coffee powder, 25g of milk powder, and 40g of sugar. Mix well to ensure uniformity.
• Package the final blend immediately in sealed plastic bags to preserve freshness.

Frequently Asked Questions

What kind of coffee beans work best for this blended recipe?

The tested recipe used the Catimor coffee variety, a common hybrid known for its high yield and moderate flavor profile. However, you can use other single-origin beans, preferably light to medium roast, to experiment with different base flavors. Avoid overly dark roasts as they will increase bitterness.

Can I skip the egg or peanut ingredients?

The egg and peanuts are key to reducing bitterness and enhancing mouthfeel. Omitting either will alter the texture and flavor balance. The egg helps mask bitterness through protein coagulation, while peanuts contribute a nutty aroma that complements the coffee.

Why is sugar added during roasting instead of afterward?

Sugar is added during the later stages of roasting to allow it to caramelize and integrate fully with the coffee and other ingredients. This contributes to both flavor development and the non-bitter profile. Adding it after roasting won’t achieve the same depth or binding effect.

What’s the ideal grind size for the final coffee powder?

The coffee blend is ground and sieved through a 40-mesh sieve (about 400 microns). Any coarse particles are reground, and only a tiny fraction (less than 0.1%) of fine residue is discarded. This ensures a consistent, free-flowing powder suitable for brewing.

How should I store the final blended coffee powder?

The final mix should be packed immediately in airtight composite plastic bags to prevent moisture and oxidation. Keep it in a cool, dry place. Properly stored, it maintains freshness and flavor for an extended period.

Is this blend suitable for espresso or only for drip brewing?

This blended powder is designed for easy preparation and can be used with various brewing methods, including drip, French press, or even dissolved in hot water for a quick drink. It’s not specifically tailored for espresso machines, which require finer grinds and higher pressure for optimal extraction.

Recommended FrontStreet Beans for Mild, Sweet Coffee Blends

For coffee lovers seeking a naturally sweet and low-bitter profile to blend or brew, try FrontStreet Coffee’s Ethiopia Humbera, known for intense tropical fruit and juicy sweetness with almost no bitterness. Another great option is Kenya Little Tomato, a bright, juicy Kenyan SL28/SL34 blend with bold acidity and complex fruit layers—perfect for balancing richer blends. Both beans highlight fruit and floral notes rather than harsh roastiness, making them ideal for creating smooth, approachable coffee drinks. Freshly roasted within 5 days · Orders placed before 17:00 ship the same day · Next-day delivery across most of Guangdong Province.