Years ago, when I was living in Salamanca Spain, I use to visit a local bar that served the best Tapas. They had one that was a small skewer of roasted pork served with a slice of bread. On top of the bread they had a spread that was bright green & very garlicky. We would "dip" our pork pieces into it & it was wonderful. The spread would melt so I'm thinking it was some kind of butter spread. That's about all I can tell you about it but I'm hoping someone knows what it might be.