Cook rice according to package instructions and set aside to cool.
Core and dice apples then toss in lemon juice. Drain lemon juice and combine apples with rice.
Combine all remaining ingredients (except vinaigrette and cheese) and mix well.
Pour vinegar in a nonreactive bowl and slowly drizzle in oil while continuously whisking. Add mustard and sugar, keep whisking until it emulsifies. Add dressing to salad and top with cheese.
