Caramelized Onion Zin-Burgers with Crispy Cheddar Frico

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1/4 cup extra-virgin olive oil

2 small yellow onions, cut in 1/2 and sliced thin

Salt and freshly ground black pepper

2 teaspoons chopped fresh thyme leaves

2 cups Zinfandel

Fricos:

1 1/2 cups sharp Cheddar, shredded

3 pounds ground beef

Sea salt and freshly ground black pepper

6 seeded burger rolls

2 beefsteak tomatoes, cut 1/3-inch thick

6 ounces spring mix salad green