01 -
In a medium-sized bowl, whisk together water, garlic, kosher salt, and lime juice. Set aside.
02 -
Heat vegetable oil over medium heat in a large, deep heavy-bottomed pan. Ensure the oil reaches about a third of the way up the side of the pan.
03 -
In batches, fry the peeled and sliced plantains. Add about a third of the plantain slices to the pan and cook for 3-4 minutes on each side until golden but slightly pale.
04 -
Remove plantains from the oil and place them on a cooling rack or a plate lined with paper towels. Repeat the frying process for the remaining plantain slices.
05 -
Using a tostonera, the bottom of a glass, or two plates stacked together, flatten each plantain. Avoid pressing too hard to prevent breakage.
06 -
Dip the smashed plantains into the prepared water mixture. Drain any excess liquid and return them to the oil. Fry for 2 minutes on each side until dark golden and crispy at the edges.
07 -
Transfer the plantains to a paper towel-lined plate to drain off excess oil. Sprinkle immediately with salt.
08 -
Whisk together ketchup, mayo, and garlic. Serve with tostones. Store leftover sauce in an airtight container for up to a week in the fridge.