I used to beg Tanya to make this potato salad for any cookout or potluck that rolled around. It's best if you let the potatoes cool so that they hold together, but she used to make it in a hurry with the potatoes still warm. They fall apart, but the salad is still delicious. I haven't had hers in years, but here's my closest approximation.

2 1/2 pounds of medium red potatoes, with skin on, boiled until just tender (about 25 minutes), drained, and cooled to close room temperature
1 bunch green onions, chopped (use all of whites and about 2 inches of greens)
1 bunch fresh dill, finely chopped
1/2 cup + 2 Tbsp. mayonnaise
1/4 cup + 2 Tbsp. red wine vinegar
plenty of coarse kosher salt and freshly ground black pepper

Quarter potatoes. Set aside.

Combine mayo and red wine vinegar until smooth. Add green onions, dill, and plenty of salt and pepper.

Add potatoes and toss well to coat.