I am a huge fan of beef satay and have finally settled on a recipe I love:

Frying steak

Stir fry vegetables

2 tbsp peanut butter (I use 1 smooth, 1 crunchy)

2 tbsp soy sauce

1 tbsp Worcester sauce

Few drops Tabasco sauce (add lots if you like it spicy!)

1 tbsp brown sugar

1/2 beef oxo cube

Method:

Stir fry meat and veg. In separate bowl mix the rest of the ingredients and dump on top of the beef. 

It will be rather solid and I add some boiling water to help it melt and make a nice sauce for the beef. 

Then pop it on top of rice or noodles and you have a delicious meal!