I'm out of white wine, can I substitute dry vermouth ?

Yes, dry vermouth is great. You may want to check several as they all have their own specific "herbal" profile. I have a favorite and it isn't expensive. Also, opened vermouth has a longer shelf life properly stored.

I too prefer white vermouth in many of my recipes. It is always at hand if you love martinis

thanks! I was feeling insecure with the choice - great to have someone else in the kitchen!

Julia Child recommended using dry white vermouth when a recipe calls for white wine. I actually prefer it in some recipes for chicken and seafood.