Meanwhile, place blackberries in a large bowl with granulated sugar. Crush into a thick jam like liquid.
Add tea bags or loose-leaf tea and pour hot water over fruit and tea.
Steep sweet tea for 5 minutes if using earl grey tea or other black tea. Slightly less if substituting black tea for green tea or white tea.
Meanwhile, place 5 cups of ice in a large pitcher.
After tea steeps, hold a fine mesh strainer or cheesecloth, over the pitcher of ice and strain blackberry tea concentrate over ice. The ice will immediately melt, diluting the concentrate and cooling the tea.
Store iced blackberry tea refrigerated up to 7 days.
When ready to serve pour blackberry tea over ice in a large glass. Add a drizzle of cream or up to a half glass of milk. Garnish with fresh blackberries, if desired. Enjoy!