Nici's go-to salad dressing 
¼ cup good quality olive oil
2 tbsps lemon juice or red wine vinegar
1 tsp wholegrain mustard
Salt & pepper to season  Shake it all up in a jar.
Add some toasted cumin seeds for a Middle Eastern or Mexican note or add half a teaspoon of sesame oil and replace the lemon juice with lime or rice wine for an Asian flavour.  
LISTEN TO AUDIO ABOVE