Make the base: Add canned tomatillos, white onion, minced garlic, Rotel tomatoes, jalapeño, and cilantro to a blender or food processor.
Season and brighten: Add fresh lime juice and salt, starting conservatively.
Blend to desired texture: Pulse for a chunkier salsa or blend fully for a smooth, pourable consistency.
Adjust to taste: Add more lime, salt, or jalapeño as needed until balanced.
Rest and serve: Let the salsa rest for 10 minutes to allow flavors to meld, then serve.
Notes
Using fresh tomatillos: If using fresh tomatillos instead of canned, remove and discard the papery husks, then rinse well to wash away the sticky residue. Add the tomatillos to a pot of lightly salted water and simmer for 8–10 minutes, until softened and olive-green in color. Drain completely and allow to cool slightly before blending. This step mellows their raw sharpness and gives you the same smooth, balanced flavor profile as canned tomatillos.Flavor tip: Boiled tomatillos produce a bright, tangy salsa. For a deeper, slightly smoky flavor, you can roast fresh tomatillos under the broiler until lightly charred before blending.Storage: Store in an airtight container in the fridge for up to 5 days.Substitutions: Swap jalapeño for serrano for extra heat or use mild Rotel if spice-sensitive.Freezing: Freeze in small portions for up to 2 months; thaw overnight in the fridge.Texture tip: For thicker salsa, pulse instead of fully blending.Variations: Add avocado for a creamy salsa verde, roast the jalapeño for smokiness, or blend in a pinch of cumin for warmth.