https://www.ediblewildfood.com/broadleaf-plantain.aspx
Edible parts: The entire plant. Young leaves can be eaten raw or cooked. They are somewhat bitter and tedious to prepare because it’s generally preferable (though not required) to remove the fibrous strands before use. Many people blanch the leaves in boiling water before using them in salads in order to make them more tender. Once blanched, plantain can be frozen then used later in a sauté, soup or stew. Seeds can be eaten raw or cooked and can be tedious to harvest. The seed can be ground into a meal and mixed with flour. Dried leaves make a healthy herbal tea.