Sneak Peak

Thanks to one of my lovely colleagues, I know exactly what to cook with what we have left--both are things I have never made before, and one is a dish I've never even eaten but is very well-known. And tomorrow she said she's bringing me cherry tomatoes from her garden.

Here's what we have left. What would you do with it? I'll let you know what happens to ours...
Red potatoes
Green beans
Leeks
Large onion
A mushroom

Hmmm... and this will turn into two dinners. Can you guess!?