Here's my take - you ate a good serving of white rice. That is probably going to raise your blood sugar faster than the yam, and even with the yogurt/ghee to slow absorption.
I'm not experienced enough to say whether this is compromised first-phase or second phase insulin release. Looks more like delayed/compromised second phase... but I'm guessing.
Can you review glycemic index charts and change the ratios of high glycemic index foods to protien/fat in your meals? Might be a little harder to do with an Indian diet. But try eating that same meal with zero white rice or even half as much white rice and see what happens. Also, can you change to brown basmati rice? etc. Watch out for those idlies 
Check out these charts about normal blood sugar response to a meal and try to devise a diet that helps you keep that curve. Here are some links:
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Parent to 4 yr old MODY3 (not expressing yet)
Diagnosed "borderline" diabetic at age 13 (1976)
Sequenced MODY3 (W267NX/N) by Exeter (2002)
Diet,exercise,herbs & acupuncture until pregnant in 2004
Sliding scale Humalog since Sep04, tried Byetta Dec08 
75% raw/Paleolithic diet since Mar09
Now only need Humalog w/cooked carbs 1-5 times/wk
Feb 2009 HbA1c: 6.1
Jun 2009 HbA1c: 5.9
Aug 2009 HbA1c: 5.8 
Viva Green Smoothies!
Last edited by notme : 08-30-2009 at 06:48 PM.
Reason: removed link
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