1. Make vinaigreete: combine red, white vinegars and raspberries - cover and let sit 48 hours then strain and store at room temperature. (Can just purchase premade raspberry vinegar).
2. Whisk 1/2 cup vinegar, oils, maple syrup, mustard, tarragon and salt.
3. Tear leaves by hand and toss in a large bowl with 3/4 cup dressing.
4. Divide on 6 plates and top with onions, blue cheese and pinenuts.