For the burger:
Combine all the burger ingredients, except the rolls, lettuce and tomatoes in a large bowl and mix well. Form into small patties about 2 inches in diameter and arrange on a platter lined with waxed paper. Cover with plastic wrap and refrigerate until ready to grill.
Preheat the grill to medium-high heat. Oil the grill grates and put the burgers on the grill to cook for 4 minutes per side. Transfer to a serving platter and serve on mini rolls with lettuce, tomato and spicy pimento mayo.
For the mayo:
Combine all the ingredients and the reserved pimento juice into a small bowl. Mix well until blended and serve with the burgers