Steam or microwave the beans until they're
tender-crisp.
While the beans are cooking, combine
the vinegar, water, garlic, salt, pepper flakes, and
dill in a small saucepan, and bring to a boil.
Drain
the beans, and put them in a jar with a
tight-fitting lid. Pour the vinegar mixture over
the beans, and cover. Refrigerate for a day or two,
shaking the jar whenever you think of it. Serve
cold.