One of the simplest Spanish delicacies is a tapa called Pimientos de Padrón, small, flavorful green peppers that are blistered in olive oil over high heat and sprinkled with coarse salt. That’s it.

This simple padrón pepper dish relies on timing and good ingredients. Start by roasting the almonds until they’re lightly golden. Use Marcona almonds for their buttery texture, and don’t skip the step ...