Ingredients

1. 2 large green plantains (about 10 ounces each)
2. 6 cups water
3. Kosher salt
4. 2 cups vegetable oil, for frying
5. 1/3 cup sour cream
6. 2 tablespoons finely chopped dill, plus dill sprigs for garnish
7. 2 teaspoons fresh lime juice
8. 6 ounces thinly sliced smoked salmon, cut into 12 even pieces
9. Paper-thin lime slices, quartered, for garnish

Directions

1. Cut off both ends of the plantains and score them lengthwise, then peel off the skin. In a large bowl, combine the water with 1 teaspoon of salt. Add the plantains and let soak for 30 minutes. Drain and pat dry with paper towels. Cut each plantain on the diagonal into 6 slices about 1 1/2 inches thick. 
2. In a large skillet, heat the oil to 275°. Add the plantain slices and fry, stirring, for 2 minutes. Transfer the plantain slices to paper towels and let cool slightly. Reserve the oil in the skillet. 
3. Wrap each plantain slice in a dampened paper towel and use a meat pounder to gently pound it into a 1/4-inch-thick oval. 
4. In a small bowl, using a spoon, stir to combine the sour cream with the chopped dill and lime juice. 
5. Reheat the oil to 375°. Add the flattened plantain slices and fry, turning once, until golden and crisp, about 2 minutes. Drain the tostones on paper towels, then sprinkle with salt. 
6. Dollop 1 1/2 teaspoons of the herbed sour cream on each tostone. Top with a slice of smoked salmon, garnish with a dill sprig and lime slice and serve.

Make Ahead

The recipe can be prepared through Step 4 up to 4 hours in advance. Refrigerate the herbed sour cream, but keep the plantains at room temperature.