Collard greens with white beans and sausage

Ingredients

• 400 g white dried beans
• 2 medium onions
• 1 small carrot
• 1 thyme sprig
• 1 rosemary sprig
• 1 bay leaf
• 1500 ml water
• 1 vegetable stock cube
• 2 Tbs butter
• 1 Tbs olive oil
• 3 garlic cloves
• 300 g collard greens—stems cut
• 300 g smoked quality sausage
• 0.5 tsps lime zest
• 2 Tbs fresh lime juice
• 0.5 tsps black ground pepper