1 1/2 pounds beef tri-tip steak, trimmed of excess fat
1 tangerine
4 scallions, sliced, plus more for garnish
1/4 cup soy sauce
2 tablespoons toasted sesame oil
2 teaspoons sugar
2 tablespoons chopped peeled ginger
3 cloves garlic, minced
Pinch of red pepper flakes
2 tablespoons orange preserves