Bean Thread Noodles with Beef and Asian Pear

4 garlic cloves, minced

1/3 cup soy sauce

2 tablespoons sugar

1 tablespoon Asian sesame oil

1 teaspoon dried hot red pepper flakes

1/2 cup plus 1 teaspoon rice vinegar (not seasoned)

1 lb filet mignon, cut into 1/4-inch-thick julienne strips

2 (14 1/2-oz) cans beef broth

1/4 cup water

1 Asian pear , cut into julienne strips

2 scallion s (green parts only), thinly sliced