Bitterness in matcha is almost always fixable. It usually comes down to the same three things.
If your matcha tastes sharp, grassy, or unpleasantly astringent — something in the preparation is off, or the matcha itself isn't what it claims to be. Here's how to diagnose it.
1. Your water is too hot
This is the most common mistake, and the easiest to fix.
Matcha should be prepared with water at 70–80°C. Boiling water (100°C) burns the delicate amino acids — including L-theanine, which is responsible for matcha's natural sweetness. Once burned, they're gone. Bitterness is what's left.
Fix: Boil your water, then let it sit for 3–5 minutes before whisking. Or use a temperature-controlled kettle set to 75°C.
2. You skipped the sift
Matcha is an ultra-fine powder. Without sifting, it clumps — and those clumps don't whisk smooth. They sit in the drink and hit your palate in concentrated bursts.
Fix: Sift your matcha through a fine mesh strainer directly into your cup or bowl before adding water. Ten seconds. Makes a real difference.
3. The grade is wrong for how you're drinking it
Culinary grade matcha is designed to be mixed into other ingredients — batter, ice cream, smoothies — where bitterness is buffered by sugar, dairy, or heat. Drunk straight or in a latte, it will taste bitter. That's not a flaw, it's just not what it was made for.
Fix: Use ceremonial grade for anything you're drinking directly.
4. It's old
Matcha oxidises. Once opened, it should be stored airtight, away from light, and used within 4–6 weeks. Old matcha loses its sweetness and develops a flat, unpleasant bitterness.
Fix: Check the harvest date on your tin. If there isn't one listed, that's its own signal.
What good matcha should taste like
Ceremonial grade, prepared correctly, is smooth and vegetal. Sweet upfront. Umami through the middle. A clean, slightly lingering finish.
Meiso — first-harvest, stone-ground, prepared at 75°C — tastes of roasted rice, bold umami, subtle pistachio, and a sweet finish. Zero bitterness.
If that's not what you're getting, the fix is usually simple. And it usually starts with the matcha.