Tip 1. Go into the garden, take one tiny flower, rinse if you think that's needed and put it on your mouth! I think that's the best way of finding out how strong a flavour is and how much or little is needed in an average recipe.
For me, I like to use them just like that in chocolate mousse or crumble. Or even sprinkle them on my vanilla ice cream from time to time.
For cookies I try to remember a day before to pick them so they dry a bit and it's easier to cut them for better distribution(?) through the cookies.
The best way to get to know how the baked goods from.the Netherlands is come here and try them;-)! The internet is filled with a whole lot of different recipes and not all are even close to describing the real thing. We have a spice mix available in every store always called "speculaaskruiden" which, again, has a lot of different recipes on the internet but definitely not all are good. The last problem is that most recipes are in Dutch. I am more than willing to go on a hunt through the wild jungle of internet recipes and find some good ones (perhaps test them) and translate them to English, of you want me to:-)? It may take a while though, super duper busy life is mean!
For the sister cookie suggestions, a few years ago my brother introduced our family to a Hemsley + Hemsley cookbook, which was my first introduction to alternative ingredients for baked goods. I have to be honest and say I snorted and rolled my eyes A LOT at this book, but so far the things I made tasted great! I love the use of dates and figs, all different kinds of "flower" and coconut oil instead of butter.
http ://www.hemsleyandhemsley.com/recipes/
Lastly I promised to talk about
oliebollen. It's the thing we eat on new year's eve, and weeks before, and at least one day after (it is amazing hangover food). There's a newspaper that publishes a test of the best oliebollenkraam (stall) every year. Best eaten fresh, hot and with an (un)healthy dose of sugar. Some families, like mine, have a special recipe, which are all basically the same except for the ammounts of bonus ingredients, for us apple, succade and sultanas. The secret part of our recipe is we grate the apple and succade so they sort of melt when you fry the oliebol, so no chunks but plenty of flavour! It takes quite some work and even more time, but I love them and haven't ever met a person that DOESN'T love a variety of them...