Butter Conversion for Europe?
Usually a stick of butter is .5 cups and .25 pounds. Google result: http://www.recipes4us.co.uk/conversion_charts.htm
Organizing Tupperware and Plastic Containers?
I stack the containers (all the same type together) and stack the rectangular lids vertically, secured between the rectangular containers and the cabinet wall. For the small, circular lids, I stack them together and store them in an old, thin icemaker box that...
Turnover Style Spinach Pie?
I prefer Spanakopita, which uses phyllo dough. I usually just mix chopped spinach, feta (already seasoned with sun-dried tomatoes, etc, from Trader Joes is a favorite) and olive oil, fold like a flag and bake until golden.
Selling Homemade Condiments?
Start with your health department. Also, our state university has a program that provides food science training (see link below). I believe some people have an established manufacturer make the product according to ones recipes.