I just noticed the USDA has put out some more Databases [to supplement their Nutrient DB.] One of those is a DB listing the Trans-Fat contents of various foods.

By percentage, Trans-Fat represents the greatest proportion of the following foods:

1) Chicken Bullion Cubes: 41.86%
2) Sweetened Corn and Oat Cereal w. Fruit-Flavored Pieces: 40.32%
3-7) Crackers (Saltine & Snack): 38.15-39.92%
8) Cookies, Vanilla Sandwich w. Creme Filling: 37.65%
9,10,13) Frozen French Fries: 36.19-37.37%
11) Refrigerated Biscuit Dough (High Fat): 38.46%
12) Chocolate Chip Cookie Dough (High Fat): 36.28%
14) Oil-Popped Popcorn: 35.24%
15) Beef Bullion Cubes: 34.49%
16,20) Fast Food French Fries: 34.16%, 32.51%
17) Shortening: 34.05%
18) Spread: 33.58%
19) Cookies, Chocolate Sandwich w. Creme Filling: 33.48%

By grams, the following foods are the highest in Trans-Fat:

1,2,8,9,11,12,14,17,19,22,24) Shortening: 12.98-32.55 (REGULAR), 20.84 (BUTTER FLAVORED)
3,7,16) Spread: 17.62-25.78
4-6,10,13,15,18,20,21,23) Stick Margarine: 13.02-22.58
25) Oil-Popped Popcorn: 12.37

Trans-Fat [Natural + Added] Content of Various Fats/Oils:

Olive Oil: 0.09g
Canola Oil: 0.16 - 0.22g
Sunflower Oil: 0.48g
Mayonaisse: 0.23 - 3.40g
French Dressing: 0.21 - 0.27g
Italian Dressing: 0.25 - 0.54g, 0.19g (REDUCED CALORIE)
Ranch Dressing: 3.71g (REGULAR,) 0.30-2.83g (REDUCED CALORIE)
Lard: 0.38 - 1.56g
Spread: 2.79 - 25.78g (REGULAR,) 9.09g (LIGHT,) 5.66g (EXTRA LIGHT)
Tub Margarine: 3.05 - 11.30g
Shortening: 10.68 - 32.55g, 20.84 (BUTTER FLAVORED)
Stick Margarine: 13.02 - 25.06g

Just a note, they tested various brands...many of which contained added Hydrogenated Oils. So, while it may list Ranch Dressing as 3.71g of Trans-Fat, that is only because the Brand they tested contained Hydrogenated Soybean Oil. Brands without Hydrogenated Oils should be much lower or completely TFA Free. They only tested one brand of Olive Oil, so the brand they tested may not have been Cold Pressed, which is belived to prevent the formation of Trans-Fats.

That answers one question I had, what would be the problem with using lard.

I am very suprised that chicken boulioun rated so far above fast food french fries. It's also interesting the vanilla samwich cookies are worse then the chocolate ones.

The Bullion is very high by percentage. But, the grams are low. This is likely because Bullion Cubes are small. French Fries by grams have more Trans-Fat than Bullion, but less by percentage. I don't know why the Vanilla Oreos (?) have more Trans-Fat than the Regular ones. As for Lard, I believe it has a very small amount of Natural Trans-Fats...and some are partially hydrogenated to extend shelf life

Natural Trans-Fats from everything I've read are not the same as the fake Hydrogenated Oils. In fact, at least one (Conjugated Linoleic Acid) is beneficial...The majority of Natural Trans-Fat in many Animal products comes from CLA. I can't find the info on Lard, but 0.212g of CLA is present for every 100g of Butter.