In a shaker tin, muddle 3-4 blackberries and 2-3 basil leaves. Add gin, lemon juice, simple syrup, and ice. Shake until chilled and double strain over ice into a large rocks glass. Garnish with basil, lemon, and blackberry. To make Green tea simple syrup: boil one cup of water and steep green tea for 5-10 minutes. Remove tea and add one cup of white sugar to hot tea. stir until dissolved. refrigerate after use. keeps up to 2 weeks.