U try cooking before? If I am not wrong the sauce shld consist of these ingredients.
Are u planning to cook the frog leg with the sauce?
My mum and sister cook braised pork belly, I also cook but they achieve the thick sauce effect but I didnt. Later I realised cos I am using slow cooker but my sister and mum using normal pot to cook.
So i tried again, this is wat I find out.
If u want thick sauce, u let the sauce boil over the heat for longer time. The sauce just get thicken.
However, If u want to achieve tender frog leg and thick sauce, u can try cook the frog legs 1st then take out and set aside. This time round, just cooked the sauce and once the sauce thicken, u throw in the frog legs. Let the frog meat coated with the sauce. Shld be able to achieve this effect now.
U try then tell me ok cos that is wat I didnt when I want to get the thick sauce for my braised pork belly. The pork belly already tendered but the sauce very watery. So I take out the sauce from my slow cooker and boil it over the heat till it thicken then pour over the pork belly again.