I used to make something called Russian Fudge, but lost the recipe in Katrina and was unable to find it again. I modified some similar recipes I found and came up with this one which my family gave the 'seal of approval'. If made with pecans, it tastes a bit like pralines, but I have used cashews and almonds for variety, and all are good.
Combine all ingredients except nuts in a VERY LARGE microwaveable bowl. Microwave on high power for 14-17 minutes (cook time depends on wattage - 14 minutes is enough for mine) stirring well every 3-4 minutes.
Remove from microwave and beat until thick (approx. 5 minutes). Pour into a well-greased 9 inch square (or roughly equivalent rectangular) glass pan (like pyrex).