I found this recipe on www.theppk.com for homemade vegan mayonnaise. I want to use it because they don't sell that stuff in my town and I hate having to travel and waste gas just to get a jar. Anywho, my question is: it calls for mustard powder. I don't have mustard powder. However, I do have mustard. Should I try using this, maybe adding it in small amounts to taste? Or is the powder completely different? help!