I find that the secret is to try different cans of sardines until you find one you like. Also, what I do is I heat up sardines in the can they came in but I drain a bit of the oil and I add some cilantro, lime juice, thai peppers, and/or garlic. That way they can come out of the oven warm and go right on toast.

they make sardines in sriracha at the acme near me. it is the best thing to happen to my snacktime this year