Broccoli Rabe Pesto

bunch broccoli rabe

kosher salt for cooking water

good extra-virgin olive oil, plus additional for dressing

blanched, slivered almonds, lightly toasted (optional)

medium clove garlic, minced or shaved

big pinch hot red pepper flakes, or to taste (optional)

fine sea salt

freshly grated aged and tangy Italian sheep cheese such as Pecorino Romano plus additional for sprinkling at the table