Char grill the beef no more than rare. Rest until it is nearly room temperature, the remove any fat and gristle and slice into 1/4 cm slices.
Drain noodles and place in a shallow bowl with drained noodles, onion or shallots, fresh herbs, tomatoes and ground rice.
Mix all dressing ingredients until palm sugar dissolves.
Taste the dressing and make sure the sweet, sour, salty and hot components are in balance.
Pour dressing over the salad and sprinkle nuts over the top.