Bitterness usually comes from brewing choices. Here are common causes and simple fixes.
1. Water Too Hot
Very hot water can intensify bitterness. Use slightly cooler water or steep for less time.
2. Steeping Too Long
Long steeping extracts more bitter notes. Shorten the steeping time to taste.
3. Too Much Peel
Excess peel makes the brew overly strong. Reduce the amount or add more water.
4. Pith Not Trimmed
The inner white pith is bitter. Lightly trim it if needed.
Overall, adjusting temperature, time, and dosage usually fixes the bitterness.