Cook the tomatillos, onions, jalapeño and garlic in boiling salted water over medium heat for 10 minutes. Drain. (If the mixture in too liquid, just return to the saucepan and let simmer for a few minutes).
In a blender, purée with the remaining ingredients. Season with salt and pepper. Refrigerate until completely chilled.
Serve with tortilla chips.
You can replace the fresh tomatillos with canned tomatillos, in which case you should cook them for 2 minutes instead of 10.
Recipes with the "Healthy Pick" stamp have been evaluated by a registered dietitian member of the Ordre professionnel des diététistes du Québec.