Beef roast encrusted with kumara chips

I think its really tasty with Kumara chips, fresh herbs from my garden ,nuts and two water cracker biscuits for a twist...

Ingredients

1 piece	Beef roast, prime cut (Main)
2 small	Crackers, I used Arnotts water crackers
1 dozen	Pistachio nuts
1 dozen	Cashew nuts
40 g	Kumara chips / wedges
1 sprinkle	Flour
2 leaves	Bay leaves
1 sprig	Rosemary
1 sprig	Fresh oregano
1 pinch	Salt
1 pinch	Pepper
1 Tbsp	Sesame oil
1 clove	Garlic

Directions

1. Preheat oven to 160
2. Place fresh Bay leaves in the bottom of an oven bag
3. Roll beef in oil,finely chopped garlic and rosemary,salt and pepper
4. Crumble Kumara chips,process water crackers,oregano,pistachios,cashews
5. Place beef in oven bag coated with crumble mixture and cook for 40 minutes,remove bag and grill until crust is golden brown, serve with roasted potato and minted peas ...