RECONSTITUTE 4 teaspoons minced onion flakes in enough very hot water to saturate completely; LET rest.
PREP remaining vegetables to specifications.
COOK potatoes in a pot of lightly salted, gently boiling water for about 7 minutes, until tender but firm to the bite); DRAIN in a large colander placed in sink; RINSE with cold water and allow to drain again.
INTO a large bowl with an (accompanying cover or lid), add the dressing ingredients EXCEPT for the sweet pickle juice and white vinegar). Note: drain excess water from onions before adding).
WHISK mixture well then add vegetables (EXCEPT potatoes) and fold gently until just blended.
GENTLY fold in drained potatoes until well-blended.
COMBINE the sweet pickle juice with vinegar then sprinkle over salad.
FOLD mixture gently until creamy, without over-mixing.