INGREDIENTS
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2 tsp. canola oil
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1 (2-lb.) boneless chuck roast, trimmed
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kosher salt
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Freshly ground black pepper
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1/2 medium sweet onion, cut into wedges
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1 large garlic clove, chopped
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2 thyme sprigs
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1/4 c. dry red wine
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4 ciabatta rolls, split and toasted
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1/3 c. mayonnaise
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1 romaine heart, shredded
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1 (16-oz.) jar giardiniera, for serving, optional