Garlic Butter Steak Kabobs

Bahan-bahan (4 porsi)

• 1 ½ pounds sirloin steak (or ribeye)
• 1 teaspoon salt
• ½ teaspoon black pepper
• 4 tablespoons olive oil
• 2 cloves garlic (minced)
• ¼ cup butter
• 1 tablespoon fresh lemon juice
• 1 tablespoon tomato paste
• 1 red onion (cut into 1" pieces)
• 1 tablespoon chopped fresh parsley (more for garnish)