[header] How to freeze pesto [title] Scoop your pesto into an ice cube tray using a spoon. [step] Fill each cell in the ice cube tray evenly. Don't put so much pesto in that the cells overflow into each other. 
If you fill the whole ice cube tray and you still have more pesto, grab a second tray to use. [substeps] The pesto may stain light-colored ice cube trays, so use trays you don't mind getting discolored.