In a large glass bowl, mix together lemon juice, olive oil, soy sauce, oregano, and garlic; add pork, onions, and green peppers, and stir to coat. Cover, and refrigerate for 2 to 3 hours.
Preheat grill for medium-high heat. Thread pork, peppers, and onions onto skewers.
Lightly oil grate. Cook for 10 to 15 minutes, or to desired doneness, turning skewers frequently for even cooking.
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