Zucchini, summer squash, sweet peppers, eggplant, winter squash--your vegetable options are almost endless.
Substitute a pint of snap peas, trimmed and cut in half, for the asparagus.
This is a blueprint for using whatever odds and ends you have in the vegetable crisper, or your CSA share.
The variety and ratio of vegetables to meat are flexible in this recipe. You could even use half the meat, and double the vegetables and sauce.