Pita Tostadas with Butternut Squash, Black Beans, & Avocado

"We ate so many amazing meals on our vacation in Maui last week: ceviches, sashimis, poké bowls, and so much macadamia nut crusted-everything that I actually thought I might turn into a fish if I looked at one more Mahi...
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"We ate so many amazing meals on our vacation in Maui last week: ceviches, sashimis, poké bowls, and so much macadamia nut crusted-everything that I actually thought I might turn into a fish if I looked at one more Mahi... "