@MaryIsobel, I recently made a Mushroom Olive Caper Tapenade which recipe came from Cooking with Mushrooms by Andrea Gentl. It was outstanding. Andrea Gentl is a famous food photographer (probably has done the photography of lots of your favourite cookbooks).
I'm sending the recipe by PM.
No anchovies though.
P.S. Andrea Gentl says tapenade will keep in refrigerator for up to 2 weeks.