This is the first I've really started using loose teas. I'm thinking of trying maybe 3/4 part peppermint to 1/4 part fennel, and see how that goes. Yes, I like to drown out the fennel too. I made some fennel that was too strong the other night, and I barely managed 1/2 cup down.
I haven't tried the jasmine yet, because when I asked the lady at the store if it had caffeine, she said it was blended with some green tea - I know this is probably hardly any caffeine, but I didn't want to try it in the evening just to be safe. I guess I may be able to spare some jasmine in an experiment with fennel - I'd hate to ruin the jasmine though.