The organization of Metlife is disgusting and sends people in circles. There is no definitive number to contact them...there are a hundred and you will get all the wrong ones unless you check back with the original employer to what contact number they may have.
To prep blackberries for making a puree: Heat the blackberries, fresh or thawed, in a saucepan over medium heat. Add 1 teaspoon of sugar and 1 teaspoon of lemon juice for every 1 cup of berries, fresh or thawed. Heat to warm the berries through, stirring as needed. Blackberry puree can be made with or without seeds. One cup of fresh blackberries produces 1/2 cup of puree, while 1 cup of thawed berries produce 3/4 cup of puree. Store the puree, seeded or seedless, in an airtight container or jar in the fridge for three to five days.
To quickly thaw blackberries, place them in an airtight plastic bag (or keep them in their original freezer bag) and submerge them in cold water for about 10-15 minutes. To keep the bag of blackberries from floating and thawing unevenly, you may want to weigh it down with a heavy dish or bowl.