This one is a cheater. Simple, chop up your tomatoes replacing the red's for the unripe. Only I had to go and try and get all experimental and fancy. yea, that didn't work.
I looked for a recipe that the base of the chili sounded like it would work well. With the unripened tomatoes you should really add a bit of sugar to help bring out the flavor. Unripe tomatoes are high is acidity and a bit tart.
The base recipe turned out to taste more like baked beans than chili that it was hard to save. But I think I got it at least reminiscent of chili flavor.
But the idea still stands, make an unripe tomato chili sauce. Green Chili!
I will do it again with Husband's chili recipe even though I don't like corn and green beans in my chili (he's a freak)
Today I am working on a dessert.