I'm pretty addicted to "Alioli", a Catalan garlic mayonnaise.
http://en.wikipedia.org/wiki/Allioli
Typically it is served with grilled lamb or sausage, or with fideua (a kind-of paella made with small pieces of pasta instead of rice). However, my addiction forces me to have a bit of it on almost anything/everything - it is especially good on the side of a plate of spaghetti tossed simply with good olive oil, salt, crushed red pepper and either fresh basil or parsely or a pinch of dried oregano, and parmesan. Also orgasmic with roasted chicken and/or roasted potatoes.