Prepare the Mojo Pork (Day 1):
Rinse pork and pat dry. Transfer to a container or zip-top bag.
Make shallow cuts across the pork surface.
Combine orange juice, lime juice, garlic, onion, cumin, salt, and pepper in a food processor. Blend until smooth.
Pour marinade over pork. Refrigerate overnight.
Cook the Pork (Day 2):
Cook pork with marinade in a slow cooker on low for 6 hours (or Instant Pot for 20 minutes on high pressure).
Shred the cooked pork with two forks.
Strain cooking liquid into a saucepan. Reduce by half over medium-high heat. Set aside.
Make the Sofrito:
Combine bell pepper, garlic, cilantro, salt, and pepper in food processor. Pulse until chopped but not paste-like.
Mix sofrito into shredded pork with ½ cup of the reduced mojo sauce.
Let sit for 30 minutes to absorb flavors.
Make the Mojito Sauce:
Combine olive oil, garlic, onion, lemon juice, lime juice, salt, and cilantro in food processor. Blend until paste-like.
Store in glass or stainless steel container in fridge.
Make the Empanada Dough:
Follow the baked empanada dough recipe for complete instructions.
Assemble and Bake:
Preheat oven to 400°F. Line baking sheets with parchment paper.
Roll dough into 5-inch circles (3 tablespoons dough per empanada).
Place filling on one half of each circle, leaving edge space.
Brush egg white around the inside edge.
Fold dough over filling and press edges together. Crimp or seal with fork.
Brush tops with egg yolk wash (1 yolk + 2 tsp water).
Bake 20 minutes until golden brown.
Serve warm with mojito sauce or chimichurri.