Homemade Vegan Worcestershire Sauce

From : http://www.marthastewart.com/258132/homemade-vegan-worcestershire-sauce
INGREDIENTS

2 cups apple-cider vinegar
1/2 cup soy sauce
1/4 cup light-brown sugar
1 teaspoon ground ginger
1 teaspoon ground yellow mustard seed or dry mustard
1 teaspoon onion powder
1 clove garlic, crushed
1/2 teaspoon ground cinnamon
1/2 teaspoon freshly ground black pepper
DIRECTIONS

STEP 1
Place all ingredients in a medium saucepan. Bring to a boil over medium-high heat; reduce heat to a simmer and cook until liquid is reduced by half, about 20 minutes. Strain through a fine-mesh sieve and let cool completely before using. Worcestershire sauce may be stored in an airtight container, refrigerated, for up to 3 months.