Yes, you can also make elderberry syrup in the Instant Pot. Pressure cook the elderberries, spices, and water on HIGH for 5 minutes. When the pressure cook is complete, do a quick pressure release to release the pressure from the Instant Pot immediately. Depending on your IP model, this may be done by pressing a button on the touchscreen panel or by twisting the pressure valve. Please check the instructions for your Instant Pot if you are not sure how to do this. When the pressure pin on the lid is down, you can safely open the lid. Press cancel and let the mixture cool for at least 10 minutes, until safe to handle.  Strain the solids through a sieve or cheesecloth into a glass jar. Press the solids with the back of a spoon to get more liquid from the berries. Add agave to the glass jar, and stir well.