Identify whether you need verjuice for a finishing acidity (vinegar-like brightness) or for cooking (needs reduced, blended tang).
Start with the listed ratio. For any swap that’s sharper than verjuice (vinegar), add a pinch of sugar to soften the bite.
For sauces or braises, simmer the substitute 30–90 seconds so it integrates rather than tasting like raw acid.
For baking, swap in the same amount, then taste/adjust: add a micro-pinch of salt for balance or a touch of sugar if the tang reads too aggressive.
Taste at the end and fine-tune with 1–2 drops more acid (or a small pinch of sugar) rather than adding a full extra tablespoon.