Mix the pastes, oregano, lime juice in a medium bowl. Add the beef and massage them, until each piece is well covered.
Cover the bowl and rest in the fridge for minimum 30 minutes - overnight if the meat needs to be tenderised.
Soak some wooden skewers in water 30 minutes before cooking.
Take the meat out of the fridge. Heat your BBQ or grill.
Cut the pepper and courgette (if used) into bite-sized chunks.
Thread the beef and veggies onto the skewers, alternating them.
Cook the skewers over medium flame to your liking.