Tuna Tarragon Pasta Salad

This is my new favorite recipe. If you've ever been to Sweet Tomatoes, they have this in their salad bar. I got the recipe from here, and when I made it, I only used shell pasta, I didn't coat the pasta with oil, I didn't put in celery, and I used regular black pepper instead of white pepper. DELICIOUS.

1 tablespoon salt
5 cups small shell pasta
1 1/4 cups penne pasta
1 cup spinach fettuccine (3-inch pieces)
2 tablespoons canola oil
2 (6 ounce) cans tuna in water
2 cups sweet pickle juice (small jar contains about 1 cup)
1 3/4 cups mayonnaise
1 1/2 cups sweet pickles (diced)
1 cup celery (diced)
1/2 cup sour cream
1 1/2 tablespoons dried tarragon leaves
1 teaspoon salt
1/2 teaspoon white pepper

1. For the pasta: In a large pot, bring 3 quarts of water and 1 tablespoon salt to a full boil. Add pastas and cook for about 10 minutes until al dente. Immediately strain pasta and cool by running cold water over pasta in strainer. Drain pasta completely and place in a bowl. Coat pasta with canola oil to prevent sticking.
2. For the dressing: Place tuna in a large bowl and break down into small pieces. Add the remaining dressing ingredients and thoroughly whisk to combine.
3. Combine the dressing and cooked pasta and mix thoroughly. ALLOW SALAD TO MARINATE FOR 8 HOURS! After 8 hours, top with more pickle juice and salt and pepper to taste.