Shaved Asparagus Salad with Ricotta and Pistachios

Finely grated zest of 1 medium lemon

freshly squeezed lemon juice (from 1/2 lemon)

champagne vinegar

minced shallot

Kosher salt

Freshly ground black pepper

pistachios

thick asparagus spears (tough bottoms removed, tips reserved for another use)

fresh ricotta

olive oil