wikiHow to Make a Lasagna Using Zucchini Instead of Pasta. With the rising number of people trying to reduce or eliminate carbohydrates from their diet, more new low carb recipes are emerging. One way to have your lasagna and eat it too is to substitute the pasta for strips of roasted zucchini. Roasted zucchini holds up nicely in a lasagna dish without the carbs and sugar generated from the pasta noodles, plus it adds wonderful flavor.