Brewing Methodology & SCA Golden Cup Standard

1. What is the SCA Golden Cup Standard?

The Specialty Coffee Association (SCA) defines a "Golden Cup" as coffee brewed within precise scientific boundaries for optimal flavor clarity and balance:

• Total Dissolved Solids (TDS): 1.15% to 1.45% soluble coffee solids in water.
• Extraction Yield: 18.0% to 22.0% solubles dissolved from the dry coffee grounds.
• Standard Brew Ratio: 55g/L to 60g/L of water (approximately 1:16 to 1:18, or ~2 tbsp per 6 oz cup).
• Water Temperature: 195°F – 205°F (90.5°C – 96°C) at contact with the grounds bed.

2. The Physics of Grounds Absorption

A common home brewing mistake is assuming that water poured equals liquid coffee in your mug.

Roasted coffee grounds are porous cellular matrices. During extraction, spent coffee grounds retain approximately 2.0g to 2.1g of water per 1.0g of dry coffee.

When selecting "By Beverage Yield" on BrewRatio, the engine reverses this equation so you brew the exact liquid volume intended for your favorite cup or travel thermos.

3. Pulse Pouring Dynamics & The 4:6 Method

Pouring all brew water at once often creates channeling and uneven slurry cooling. Segmented pulse pouring unlocks layered flavor profiles:

• The Bloom (Pre-wetting): Saturating grounds with 2x to 3x coffee weight for 30–45 seconds releases carbon dioxide gas, allowing water to permeate deeply.
• SCA 3-Stage Pour: Bloom (20%) → Stage 1 (40%) → Stage 2 (40%) balances thermal stability with gentle agitation.
• Tetsu Kasuya 4:6 Method: World Brewers Cup Champion technique separating the first 40% (governing acidity vs. sweetness) from the remaining 60% (regulating strength and body).