If you're looking for something a bit more authentic and less touristy, Lasse i Parken is the place to go. We visited on a Monday night and the place was packed with locals, very few tourists in sight. They have tons of outdoor seating, but reservations are necessary to guarantee a table. You order your food and drinks at the bar and a server brings it out to your table. It was a little confusing to figure out at first, but once you know the deal it all goes smoothly. The food is typical Swedish fare and was tasty and relative affordable for Stockholm. In Södermalm and easy to reach via the subway Hornstull stop.
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