Score each cherry with knife at seam circularly around center and slice in half
Using your fingers, remove cherry pits and discard
Place halved cherries in a large salad bowl
Clean and trim scallions, removing tips of green ends and white frond ends
Place entire bunch of scallions on cutting board and slice in half, separating green ends from white ends
Take white ends and slice each scallion lengthwise into very thin strips
Add to cherries bowl
Remove stem and seeds from serrano and slice thinly
Add to cherries bowl along with pinon nuts
Toss well and drizzle with vinaigrette