Some US sites allow you to switch units. e.g. if you click on 'US units' here
http://www.food.com/recipe/best-red-pesto-sauce-76698
you're given the option to switch to metric units. (OK, you need to do a bit of rounding but it's not exactly rocket science to change '118.29 ml' to '120ml').
That recipe has excellent reviews, BTW.
The chilli and parmesan in this (British) recipe should give the flavour a bit of a kick!
This (also in metric units) looks good too:
http://www.discover-italian-food.com/red_pesto_recipes.html
http://www.deliciousmagazine.co.uk/recipes/red-pesto/