Disruptive tomato salad with canned peas and artichokes

I don't think I have ever had a tomato salad with yoghurt dressing. Have you?

Let's try this:
tomatoes
artichokes
peas
and thyme

a shallot for the dressing, have this sit in lemon juice, sugar and salt for a bit, before you add some olive oil, mustard and, finally, the yoghurt.