Niman Ranch Burgers

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2 pounds ground Niman Ranch beef or other grass-fed premium beef (80 percent lean and 20 percent fat)

1 tablespoon good Dijon mustard

3 tablespoons good olive oil, plus extra for brushing the grill

1 teaspoon kosher salt

1 teaspoon freshly ground black pepper

3 sandwich-size English muffins, halved

Good mayonnaise

Caramelized Onions, recipe follows

Caramelized Onions:

2 tablespoons good olive oil

2 tablespoons unsalted butter

2 pounds yellow onions, peeled and sliced in half-rounds

1/2 teaspoon fresh thyme leaves

2 tablespoons sherry wine vinegar

1 teaspoon kosher salt

1/2 teaspoon freshly ground black pepper