Scrub potatoes. In large pot of boiling water, cook potatoes for about 15 minutes or until tender. Drain and let cool for 10 minutes. Cut into bite-size chunks; place in large bowl. Meanwhile, slice onion thinly crosswise; add to bowl.

In small bowl or glass measure, whisk together oil, lemon juice, vinegar, mustard, salt, pepper and hot sauce; pour half over warm potato mixture and toss to coat. Let cool to room temperature, about 2 hours. Toss with dill and remaining dressing. (Salad can be refrigerated in airtight container for up to 24 hours.)

To keep salad longer, place dressing in a separate container until ready to serve. Store dressing and potatoes in fridge and combine when ready to eat!