Beer Braised Beef and Onions

Ingredients

• 4 tbsp olive oil (divided)
• 8 cups yellow onion (sliced (about 2 onions))
• 2 lbs stew meat (cut into 1 1/2-inch cubes)
• 3 tbsp flour
• 2 cups lager beer (room temperature)
• 1 cup low-sodium beef stock
• 1 1/2 tsp kosher salt (divided)
• 1/4 tsp ground pepper
• bundle of rosemary and thyme (tied together)
• 1 bay leaf (torn in half)
• 2 tsp red wine vinegar