Spring Peas and Greens with Cacio e Pepe Dressing

INGREDIENTS

lbs Fava beans

Garlic clove, small

4 cups

Greens, spring

Hass avocado, wedges thin

2 cups

Peas, fresh or frozen

Egg yolk, large

Kosher salt

3/4 tsp

Peppercorns, coarsely cracked black

1/2 cup

Olive oil, extra-virgin

3 tbsp

Buttermilk

3 tbsp

Parmigiano-reggiano cheese plus more