Potato Fennel Soup

Bahan-bahan (4 porsi)

• 5 ounces bacon, cut into 1-inch pieces
• 1 bulb fennel, very thinly sliced (with fronds reserved for later)
• 1 white onion, diced
• 1 tablespoon fennel seeds
• 5 cloves garlic, minced
• 6 cups chicken or vegetable broth
• 1 1/2 pounds Yukon gold potatoes, cut into bite-sized pieces
• 1 tablespoon minced fresh rosemary
• 1/4 to 1/2 teaspoon crushed red pepper flakes
• fine sea salt and freshly-ground black pepper
• chopped fresh chives, for topping