If using raw almonds, it will significantly enhance the flavour of your pesto and improve the digestibility of the almonds if you toast them first under the grill setting in your oven. Set to 240 degrees celsius and place them on a flat tray near the top of the oven and watch them like a hawk. Toasting can take 2-5mins depending on heat and proximity.
Put all ingredients into a food processor and mix until an even consistency is achieved. Try not to blend overly or it will turn into a smooth paste. Ideally you want a little texture.
Will last around 5 days in the fridge