Sausage and white bean soup

Ingredients

• 1 tablespoon olive oil
• 450 grams packet beef sausages
• 1 onion, thinly sliced
• 2 baby fennel, trimmed, fronds reserved, thinly sliced
• 2 tablespoons herb and garlic tomato paste
• 6 cups (1.5 litres) beef stock
• 400 grams can cannellini beans, rinsed, drained
• 1 bunch broccolini, trimmed, cut into 3cm lengths
• 1/4 cup chunky basil pesto
• 1 small baguette, sliced, toasted