Remove the corn from the cob with a knife. Set the corn aside and roast the cobs in the oven at 400 degrees for 30 minutes or until the cobs are golden brown. This helps bring out the sweetness of the corn.
Place the cobs, garlic, thyme, basil and mint stems, mushroom stems, and spices in a pot. Cover with water and bring to a boil, then simmer for an hour and a half. Strain and reserve.
Saute the onion in the butter and with salt until translucent. Add half the corn and saute with the onions. Add the potatoes and then cover with the corn broth. Simmer for a half hour or until the potatoes are tender. Puree the mixture and pass through a fine sieve (this should remove any of the starchy bits of corn). Add more corn broth to create a broth-like consistency. Season.
Lay the mushrooms gills-up on a roasting trey and sprinkle liberally with olive oil and salt. Roast at 400 until golden brown and crispy. Cut into slices.
Saute the other half of the corn in olive oil. Combine the mushrooms, corn, red onion, squash, minced basil and mint, and vinegar. Season. Place the salad into individual bowls and pour the broth over the salad for your guests.
Chef & activist Daniel Klein and cameragirl Mirra Fine are road-tripping around the United States, filming and editing The Perennial Plate -- an online weekly documentary series dedicated to socially responsible and adventurous eating -- as they go. See below for Perennial Plate's recipes, shared weekly with food52 from the road!