Beans in basil & tomato sauce

Ingredients

• 1 tbsp olive oil
• 1 red onion
• 2 garlic cloves
• 1 tsp rosemary
• 2 tbsp tomato puree
• 2 tins chopped tomatoes
• 1 tbsp basil
• 2 tbsp crema di Balsamico (balsamic cream)
• 2 tins white beans
• 1 ½ dl water
• 1 tsp salt
• a little pepper