Brew tea in 2 cups water for 8 minutes, then strain. Stir in agave and grenadine until dissolved and chill until very cold.
For each drink, muddle 4 pineapple chunks and half a lime wedge in a shaker.
Add ice, 2 oz coconut milk, 1.5 oz coconut rum and 8 oz chilled tea mix. Shake for 15 seconds and strain into two ice-filled glasses. Garnish with lime wheel and pineapple slice. Happy sipping!