Waldorf salad questions

[NisAznMonk]

So far I've gathered the following for my Waldorf salad:

• 1/2 cup chopped, slightly toasted walnuts
• 1/2 cup celery, thinly sliced
• 1/2 cup red seedless grapes, sliced (or a 1/4 cup of raisins)
• 1 sweet apple, cored and chopped
• 3 Tbsp mayonnaise
• 1 Tbsp fresh lemon juice
• Salt
• Pepper
• Lettuce

Questions:
1) how do you "slightly toast" walnuts?
2) how different will it taste with yogurt instead of mayo?
3) can I use bottled lemon juice?
4) I'm used to buying the packaged salads at the grocery store. Is that not recommended for this? I was just going to get the regular iceberg lettuce pack.

 

[texasgirl]

Just put some walnuts on a baking sheet in the oven at about 300 degrees F for about 15 minutes.
Yogurt may be okay, but, give it a tangy taste that mayo wouldn't
bottled lemon is fine
iceberg is fine also.

 

[sage™]

you can also toast them in a dry frying pan on top of the stove,,
I have my own version of waldorf I threw together with what i had on hand.
chopped apples..raisens..walnuts and mayo..the raisens plump up. If i have some raisens I'm gonna make some today..lol..sounds good to me right now