If you can, find a copy of The Weed Cookbook by Adrienne Crowhurst it's awesome.My copy is old,published 1972.
She suggests harvesting the dandelions before they bloom as they get more bitter after flowering.They were once used as a cure for scurvy,they are high in protein,calcium,phosphorus,iron,riboflavin,niacin,vitamins A,C and B1.
The grape leaves are also good to add to pickles,and they look nice in the jar.
I harvest a lot of wild food for my Iguana,it's healthier than store bought greens,She loves Mulberry leaves and dandelion.
She also mention cooking the dandelion roots like parsnips,and roasting the roots for about two hours till they are dry and brittle and grinding for a coffee substitute.I tried making dandelion wine once but must have done something wrong because it was nasty.
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I am the dust that dances in the light. - Rumi