Peel the plantains and cut them into slices about 1.5 cm thick. Place the slices next to each other in the airfryer and mix with 2 tbsp. olive oil. Bake the slices for 10 minutes at 160 C.
Meanwhile, combine the peppers, cilantro, garlic, water and lime juice in a blender and grind coarsely. Then add the finely chopped spring onion and salt and mix everything together.
Then gently flatten them with the bottom of a pan. Bake them for another 10 minutes at 180 C until crispy and golden brown. Sprinkle with some salt and spring onion.
Serve the warm tostones with the Aji Criollo sauce on the side.
Enjoy your meal!