In a small container, mix butter, merkén and salt until obtaining a homogeneous mixture.
Brush each corn on the cob with ½ tbsp butter.
Arrange the buttered corn on the cob in the Instant Vortex basket and insert in the appliance.
On the Instant Vortex control panel, press Air Fry, set the time the time to 8 Minutes and the temperature to 380ºF (190ºC). Press Start. Ignore the Add Food message when it appears.
When Turn Food appears on the display, remove the basket, shake it to move the corn on the cob and reinsert it in the Instant Vortex.
When the timer goes off, open the compartment and remove the buttered corn cobs with tongs.
Serve immediately with the rest of the merkén butter. Sprinkle with chopped fresh cilantro (optional).
If it is necessary to reheat them, press Heat, then set temperature to 355ºF (180ºC) and time to 5 Minutes.