Canned sweetened condensed milk is also an abomination. I think all of this stuff is set out plainly in Leviticus. To make it yourself (as God intended) follow these simple instructions:

4 cups whole milk
2 cups white sugar
1 vanilla bean

Combine the milk, sugar and vanilla bean (split and scraped) in a heavy saucepan over medium-low heat, stirring until the sugar is completely dissolved. Increase heat until the mixture begins to actively simmer and cook for about an hour, stirring from time to time, as it may stick to the bottom of the pan. The mixture will be done when it has thickened, reduced by about half, turned a light tan colour and registers about 225F on an immersed thermometer. Strain and chill; keep refrigerated.