Sweet Potato Fries with Asian Dipping Sauce

Sauce:                
⅓ cup rice wine vinegar
¼ cup soy sauce    
1 Tablespoon sesame oil            
1 teaspoon minced garlic            
1 teaspoon peeled and finely grated ginger    
¼ teaspoon crushed red pepper
Fries:
1½ pounds sweet potatoes, peeled and cut into 3-inch lengths, about ½-inch thick
2 Tablespoons canola or vegetable oil
½ teaspoon Chinese five-spice powder
½ teaspoon coarse salt