My kids think I'm weird for using anchovies in most of my non-curry cooking to add a deep flavour. I melt the anchovies in the cold oil as it warms up before browning onions or the mirepoix. I'm sure that I got this idea from an Italian cook book years ago.
My favourite Ragu is the Giorgio Locatelli version from his "Made in Italy" cookbook. I always add anchovies, powdered porcini and beef stock or bone broth to embellish the original recipe. The resultant flavour is banging.
T63