Broccoli cheddar ale soup

INGREDIENTS

• 1 tablespoon olive oil
• ½ medium red onion, diced
• 4 whole green onions
• 2 whole garlic cloves, minced
• 2 bunches of broccoli
• 1 teaspoon dry mustard (preferably coleman’s)
• 1 teaspoon 
sea salt
• 1 teaspoon fresh ground pepper
• ¼ cup flour
• 1 bottle (12-ounce) ale
• 2 cups skim milk
• 2 cups chicken broth (1 cup reserved)
• 4 cups grated cheddar