Xanthippe, I love Jazz Cooking (Thanks JP!) It works well for most dishes, but you have to be careful not to go too crazy with altering recipes for baked desserts, otherwise they might not rise properly. My main approach is to read a lot of recipes. I love cookbooks with all the beautiful photos, especially ones focused on a particular culture. I narrow the recipes down to one or two that will provide the best overall structure (proportions, cooking method, fresh ingredients, etc.) and then wing it from there.
Years ago I went through an Indian phase-- curries, dahls, rice pudding etc. I am a huge fan of Mediterranean cooking and love serving Meze and Tapas, even for a weekday dinner. Years ago I ventured into Greek cooking and learned how to make moussaka and how to cook with phyllo dough. I enjoy making spanikopita and baklava-- both a lot of work, but well worth it for a dinner party. I find Mexican recipes (tacos, burritos, tortillas, fajitas, enchiladas, etc.) to be quick and easy and very adaptable to whatever I have in the pantry and refrigerator at the time. Summer guacamole is the best!
One time I made seafood risotto for 30 people, and it was a hit, but I wouldn't do that much work again! One dessert that is simply beautiful is Julia Child's recipe for a French Apple Tart, but it is an all-day project. I just hosted a summer barbecue and finally learned how to make moist and tender grilled chicken. I also found a recipe called Farmer's Market Parpadelle. The only thing I added was shaved parmesan on top. Several guests asked for the recipe-- it just tastes like summer to me, so simple with fresh veggies and herbs. PM me for the recipes if you like.
I'm traveling to Portugal and Spain in a few weeks to check out retirement possibilities and will definitely be checking out the local cuisine!