Grilled Artichoke Pesto Zucchini Bites

lbs zucchini (about 2-3 large zucchini)

package frozen artichoke hearts, thawed and squeezed of excess water

zest of 1 lemon

lemon juice

garlic, roughly chopped

the leaves of half a bunch of parsley (about a cup)

walnuts

salt and pepper

extra virgin olive oil

parmigiano reggiano, grated (about 1/2 cup)