Season meat (chicken and beef) on both sides salt and season. Or just use your favorite spice mix. Then let sit at room temperature for at least 15 minutes.
Heat a Dutch oven or large pot over medium-high heat. Add oil to the pot.
Then add the meat (do so in batches if desired) or brown the beef and chicken separately. Let it sear for about 2 minutes before turning the chicken over.
Cook for about 6 minutes or until brown. Then add the sausage and cook for another two minutes.
Add sofrito, garlic, cumin, paprika, oregano, and sazon. Sauté until fragrant, about a minute. Then add onions, and cook for about 5 minutes.
Pour in water or broth. Return the meat to the pot and bring it to a boil, lower the heat, and simmer for 15-20 minutes, depending on your cut of beef. Cook less if only using chicken.
Next, add root vegetables, starting with the one that needs the most time to cook – in this case, green plantains. Cook for about 10 minutes before adding the yuca, squash, potatoes, and corn.
Continue simmering the stew for 10 minutes until the meat and veggies begin to soften.
Season with salt, pepper, and other seasonings to taste.
Continue cooking until root vegetables are tender, 15-20 minutes. The stew should be thick and hearty; if not, mash up a few root vegetables to thicken it.
Serve in large bowls, and top with chopped cilantro.