For me it has to be a really nice beef and red pepper stew, with lots of paprika, garlic and red wine, served with either roasted Brussels sprouts or fried cabbage.

I go with a stew as well.  Leeky lamb stew with dumplings is my favourite.  Leave it overnight to get cold, scrape off the excess fat and heat it up.  Always best second time around anyway.

I find curries and spagbol comforting meals too.

Lobster & Butternut Squash Risotto will do the trick for me.

or a lazy option: Cornish cream tea.

Lentil soup or Shepherd's pie, maybe? But really, the most comforting thing is buttered toast/crumpets/whatever and a milky drink, e.g. hot chocolate. I've been experimenting with masala chai recently, great stuff for a cold day.

I usually cheer up making the most yellow polenta to go with everything: stravecchio cheese, fried eggs, a pan of fresh cropped savoy(??) cabbage boiled and stirfried with oil and garlic, adding slowly their boiled in water

or doing in 15 mins the little ricotta pancakes I learnt from Maria Sorokina's blog called syrniki, they fill you with sweet good food and joy