Recipe video above. Don't skimp on pesto, and don't be shy with olive oil. If you do, you'll end up staring at a mound of flavour-lacking, dry pesto pasta salad, thinking "darn it, I should have just followed the recipe!".PS Just 2 tablespoons of mayo is the secret here. Just gives an edge of creaminess without weighing it down, plus significantly improves the quality of next-day leftovers - prevents it from drying out.TIP: Homemade pesto obviously rules here, but if you need to resort to store-bought, get it from the fridge rather than aisle. It's better.