The phrase "strained vegetables" refers to vegetables that have been cooked until they are very soft and easily mashed into a smooth consistency. Full definition
When 24 hours has passed, you just need to take a plastic strainer (like one you'd use for straining vegetables, or rice) and gently pour the kefir into a bowl, making sure the strainer catches the kefir grains, and it's ready to use. (my.lumitylife.com)
Strain vegetables from stock and discard. (addapinch.com)
Babies can start eating meat after they willingly have cereal as well as strained vegetables and fruits between 7 and 10 months. (newkidscenter.com)