"plenty of sugar" is correct and usable in written English. You can use it when you want to refer to a large quantity of sugar. For example: "I brought plenty of sugar for the cookies we're going to bake.".
Plenty of sugar and carbohydrates are favored, too.
There's plenty of sugar in the sauce that will caramelize.
"There's still a lot of flavor and plenty of sugar in the cobs," he said.
johan1974: Our grandparents ate lard on toast and plenty of sugar if they could afford it.
Probiotics also help improve your skin, so eat plenty of sugar-free yogurt.
There are plenty of sugar-free foods across the country, and remember, just because it's labelled sugar free doesn't always mean that it is taste free.
Soaking will dissolve low molecule sugar from feedstock, so the feedstock after long-time soaking lost a plenty of soluble sugar.
Being a terminologist, I care about word choice. Ludwig simply helps me pick the best words for any translation. Five stars!
Maria Pia Montoro
Terminologist and Q/A Analyst @ Translation Centre for the Bodies of the European Union