Mushroom Florentine Soup

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1 tablespoon unsalted butter

6 ounces button mushrooms, rinsed and sliced

1 tablespoon minced red onion

1 clove garlic, minced

1/2 teaspoon kosher salt

1/4 teaspoon freshly ground black pepper

2 1/2 cups no-sugar, low-sodium beef broth

2 tablespoons white wine

1 cup trimmed and washed spinach leaves

1/2 cup heavy cream, at room temperature

12 enoki mushroom stems, bottoms removed, optional