Combine the pork, red onion, bell pepper, lemon zest, lemon juice, 1/3 cup olive oil, garlic, oregano, rosemary, 2 teaspoons salt, and 1 teaspoon black pepper in a large (1-gallon) plastic storage bag. Press out the air, seal, and set aside at room temperature for 30 minutes or refrigerate for up to 12 hours.