Black Bean and Mango Salsa

I love this stuff.  I can just sit and eat it with a spoon. :)  It is great with chips and on chicken and fish.

1 can of black beans, drained and rinsed
1 medium mango, peeled and diced (about 1 cup)
1/2 of medium red onioin (about 1/2 c. cup)
1/2 c. chopped fresh cilantro
2 T. lime juice
2 t. red wine vinegar
1/2 t.  sugar
1/4 t. garlic powder
1/4 t. salt
1/8 t. black pepper
(optional) 1 medium avocado, diced

1.  In a large bowl, combine the black beans, mango, red onion, and cilantro.
2. In a small bowl, combine lime juice, vinegar, sugar, garlic powder, salt and pepper.  Stir to dissolve sugar and then pour over black bean mixture.  Cover and chill in the fridge for at least an hour.
3.  When ready to serve, gently fold in the diced avacado (optional).  Season with salt and pepper to taste.