Salmon and White Bean Soups with Basil and Garlic Oil

One of the best soups I have made came about through a coincidence of leftovers. I had cooked jumbo lima beans and made them into a smooth, white purée as a change from hummus. I served it with a pungent basil and garlic-flavoured olive oil spooned on top. For the main course, I poached a piece of grilse, young wild salmon. With the leftover fish and purée, I planned to make a smooth, creamy, pal