Blend the cilantro, parsley, serrano chiles, garlic, lime juice, lemon juice, and ice-cold water until completely smooth
Season with kosher salt to taste
Strain through a fine-mesh sieve for a silky texture
Refrigerate until ready to use
In a medium bowl, make an ice bath by adding 1 tablespoon kosher salt and mixing to dissolve
Peel and devein your prawns
Make a shallow incision through the back of each prawn and lift out the dark vein
Add prawns to the salted ice bath for 5 minutes to preserve sweetness and chill evenly
Remove prawns and rinse under ice-cold water
Pat dry with paper towels
Slice each prawn in half lengthwise
Arrange prawns in a shallow dish and pour over the chilled aguachile verde
Let marinate for about 10 minutes
Arrange marinated prawns on a plate
Scatter green apple matchsticks, red onion, radish, and avocado slices over the top
Drizzle with extra virgin olive oil and finish with Maldon salt
Garnish with cilantro