Toss the cabbage, tomatoes, and onion with the lime juice, vinegar, salt, and pepper.
Massage lightly for 1 minute, then cover and rest for at least 30 minutes. Drain excess liquid before serving.
Cook the Yuca:
Place the yuca in a large pot, cover generously with water, and add 1 teaspoon of the salt.
Simmer for 25 to 35 minutes, until tender and beginning to split. Remove any firm central fibres and keep warm.
Make the Chicharrón:
Put the pork belly, water, and remaining salt in a heavy pan. Cover and simmer over medium-low heat until the water evaporates and the pork begins to render.
Uncover and fry the pork slowly in its own fat, turning often, until tender inside and irregularly crisp outside, 35 to 45 minutes. Drain briefly.
Assemble:
Arrange warm yuca on plates or banana leaves. Add chicharrón and a generous loose spoonful of curtido, then serve at once.
Notes
Fresh yuca should be peeled past the pinkish layer before cooking.
The curtido can be prepared one day ahead; add the tomatoes a few hours before serving for the best texture.