Ruby Red Pretzel Dip

1 (16 ounce) can jellied cranberry sauce
3/4 cup granulated sugar
1/4 cup vinegar
1 teaspoon ground ginger
1 teaspoon ground mustard
1/4 teaspoon ground cinnamon
1/8 teaspoon pepper
1 tablespoon all-purpose flour
1 tablespoon cold water
Red food coloring (optional)
Pretzels

In a saucepan, combine the first seven ingredients; whisk over medium heat until smooth. Combine flour and cold water until smooth; add to cranberry mixture. Bring to a boil; cook and stir for 2 minutes. Transfer to a bowl; stir in food coloring if desired. Cover and chill overnight.

Serve with pretzels.

Yields 2 cups.