Tomatillo Salsa

Ingredients

• 5 tomatillos, husked and halved
• 1 serrano, stem removed and halved the long way
• 0.5 small white onion, finely chopped
• cilantro, minced
• salt

Method

Heat a cast-iron-pan over medium-high until it's too hot to hold your hand above — about three minutes. The tomatillos and serrano want direct contact with metal, not a gradual warm-up. Place the tomatillo halves and serrano halves cut-side down on the dry pan. You're aiming for roasting that blackens the flesh and concentrates the sugars, not just surface colour. Leave them untouched for four to five minutes. The tomatillos will soften and the serrano's skin will blister and split — that's when you know the heat has penetrated deep enough. Flip and roast the other side for two to three minutes. You want an uneven char; a few dark spots against pale patches mean you've hit the sweet spot. A uniformly brown surface suggests the heat's too gentle.

Transfer the roasted tomatillos and serrano to a blender. Add water — start with 60ml and add more only if the blade stalls. The flesh is already releasing liquid as it cools, so restraint matters here. Purée until completely smooth with no flecks of skin visible. The salsa should have body, not the watery texture you get from over-dilution. Taste for heat and adjust the serrano ratio next time if needed; one serrano makes a salsa with backbone, not a condiment for the nervous.

While the mixture cools to room temperature — crucial, this — prepare the onion. The sharp bite of raw white alliums mellows slightly with cold water. Soak the finely chopped onion in cold water for five minutes, then drain thoroughly. This removes the sulfurous compounds that dominate when the onion is first cut, leaving behind a cleaner flavour. If you add raw onion to hot salsa, those harsh volatiles actually intensify rather than fade. The cilantro should be minced fine and stirred in just before serving, along with the blanched onion and a pinch of salt. Fresh herbs lose their bright, grassy character under heat, so holding them back is non-negotiable for any fresh-herbs condiment. Taste and adjust salt — tomatillo salsa can absorb more than you'd expect without becoming aggressive.