Smash the cardamom pods to release its flavor and aroma. You can do this with your mortar & pestle - just gently tap the pods until the outer shell is cracked. If you don't have a mortar & pestle, place the pods on a cutting board and with a heavy chef's knife, use the bottom of the handle to smash the pod.
In a saucepan over medium heat, bring half-and-half or cream, sugar and cardamom pods to a simmer, turn off the heat and allow to steep for 15 minutes. Remove the cardamom pods then add the almond extract.
Fill 4 tall glasses to the brim with ice. Divide the flavored half-and-half or cream between each of the 4 glasses. Then slowly pour the coffee into each glass.