It's not a browned butter recipe ... I should have clarified that. But the cooking technique is almost the same. The only difference is the seasoning (standard greenish supermarket "curry powder", aka "English" green curry powder), and the fact that you're using roux and a little liquid, to make a built-in sauce, which goes over rice.
As for how much roux: figure 2 tbsp flour plus 2 tbsp clarified butter (2.5 tbsp if not clarified) makes just over 3 tbsp of roux**, which is enough to thicken 1 cup of liquid ... from memory, that's probably enough for a pound of shrimp.
Garnish with a little diced tomato, added in the last 60 seconds.
If you have almost any version of a
Betty Crocker cookbook, it's in there .. it's been a staple of that book for 50+ years, and it's survived the test of time.
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* ROUX: I keep a 1 cup glass jar of pre-made blonde roux (and 1-2 pts of ghee) in the lower rear of my fridge - I just spoon out a little whenever I need it, and make more when I run out (or if it gets long in the tooth).