Can I use a regular cast-iron skillet instead of a grill or comal?
Yes. Heat a cast-iron skillet over medium-high heat and char the onion, garlic, and peppers in batches, 3–4 minutes per side, until blackened spots appear.
How spicy is this salsa verde?
Heat level depends on serrano pepper ripeness and seed removal. Green serranos are moderately spicy; remove seeds and membranes for milder salsa, or use fewer peppers.
Can I make this ahead?
Yes. Store in an airtight container in the refrigerator for up to 5 days. Flavors deepen overnight. Stir before serving.
What's the difference between this and canned salsa verde?
Charring the vegetables adds smoky depth and caramelization that canned versions lack. Fresh cilantro and lime juice also provide brightness canned salsa cannot match.
Can I substitute fresh tomatoes for canned fire-roasted?
Yes, use 3–4 medium fresh tomatoes, halved and charred cut-side down until blackened. The result will be fresher but less smoky than fire-roasted.