You would think that I would know this with my tummy not accepting milk alot of the time, but really the only substitute I know of is soy milk. Soy can we switched out for any milk (half/skim/whole) but heavy cream? Don't know. I seriously dislike cooking with soy, the taste is NOT there. I've done it before because I had nothing else in my fridge, but didn't like the taste.
Heavy cream is hard to replace because of the thickness, reducing soy milk makes it taste worse in a recipe and can't hold up to the heat.
Found this recipe, wonder if it would work...
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HEAVY CREAM SUBSTITUTE
To make vegan heavy cream substitute you will need: 1/2 block of silken tofu (extra firm) and 1/2 cup of plain soy milk. Blend in blender (do not use mixer) until thick and creamy and there are no more lumps.
Better than Whipped Cream
Ingredients:
3/4 cup Silk vegan soymilk - vanilla
1/4 + 1/8 cup Better Than Milk soy powder - vanilla
1 tablespoon rice syrup
1 1/2 teaspoon vanilla extract
1/2 teaspoon coconut extract
1/2 cup canola oil
1 tablespoon lemon juice
Blend together milk and milk powder. Let stand 5 min. to fully dissolve. Then blend in sweetener and extracts. On high speed, slowly drizzle oil into mixture. Continue slowly adding lemon juice. Refrigerate. This will continue to thicken in fridge and will be thick, creamy, and delicious.
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Found this too...
(Thank GOD cinn isn't vegan, I can handle the no meat policy, but no egg or cheese? *Shudder*)