Zucchini has always fascinated me. Left raw, it leaves me cold and cooked too much, it's mush. For a long time I've made a stir-fry zucchini dish that would go from perfect to the afore mentioned mush in an instant. It has onions, tomatoes, and zucchini cut into slices and I've experimented with many different incarnations.
After eating a similar dish at the Getty Center for lunch last week I came up with what I think is a winner. The squash held up quite nicely and was still nice and firm the next day for lunch.
Two small zucchini squash sliced in 3/4 inch slices
1/2 sweet onion sliced in wedges
1 cup sliced Crimini mushrooms*
1/4 cup pesto without cheese
1 Roma tomato, quartered seeds removed
I made a quick pesto with about a cup of fresh basil, chopped garlic, salt, pepper and enough olive oil to make a paste.
I cut the squash in circles at least 3/4 of an inch wide. This way I could get some "color" on the zucchini without cooking it to death.
I cooked the onions and mushrooms separately, removed them from the pan to saute the squash with the pesto. Then, when it was just barely cooked, I tossed back the onions and mushrooms and quartered Roma tomatoes. This only gets a very quick stir to heat the tomatoes and blend the flavors. Off the heat I tossed in some Parmesan cheese and served.