Season the mackerel with salt and place on a hot grill skin side down for about three minutes, or until cooked ¾ of the way through.
Flip the fish and finish cooking on the opposite side, about one minute.
Remove from grill and season with lemon juice and Maldon salt.
Place 3 tablespoons of blackberry juice into a bowl, add smoked almond milk and top with cooked mackerel.
Add a dollop of romesco to the plate and garnish with mint and parsley.
Smoked Almond Milk
Place the almond milk in a wide bowl and cover with plastic wrap.
Smoke the contents of the bowl using a smoking gun until the desired smoke flavor is achieved.
Blackberry Romesco
Puree bell peppers, garlic, almonds, pecans, parsley, sherry vinegar, paprika, cayenne pepper and ½ cup of blackberries in a food processor until slightly chunky.
Slowly drizzle in olive oil while pureeing and season with salt.
Remove from processor and fold in ½ cup chopped blackberries.