Smithey's Favorite Pot Roast – Smithey Ironware

Ingredients

• 6 lbs boneless chuck roast (1 large or 2 medium pieces)
• 2 tablespoons canola oil
• 2 tablespoons unsalted butter
• 2 onions, minced (about 3 cups)
• 1 tablespoon chopped garlic
• 2 tablespoons tomato paste
• 1 tablespoon all-purpose flour
• 3 leeks, washed well and cut crosswise into large coins
• 1 1/2 lbs carrots, peeled and cut into large pieces
• 2 lbs baby Dutch gold potatoes, large ones halved, smaller ones left whole
• 3 cups beef broth
• 4 sprigs fresh thyme plus 1 teaspoon chopped fresh thyme
• 2 sprigs rosemary plus 1 teaspoon chopped fresh rosemary
• Coarse kosher salt, to taste
• Freshly ground black pepper, to taste
• 1 tablespoon Dijon mustard, plus more for serving