Identify your dish goal: you want the tingling/numbing effect (málà) or mainly the citrusy aromatic top note.
Pick the closest match from the table: Japanese sansho for the nearest experience, or roasted coriander for an aromatic backup.
Use the listed ratio; for blends with citrus, start low on zest and scale up only after tasting.
If using whole spices (seeds), dry-toast briefly (30–60 seconds), then grind so flavors bloom before mixing into the sauce or seasoning.
Taste at the end: add a little more for brightness, but avoid overdoing zest or you’ll lose the peppercorn character.