Not tried them, but below is all the meals you can request...

Religious Meals

Kosher Meal: Pre-packed and sealed; contains meat
Muslim Meal: No alcohol/pork/ham/bacon
Hindu (Non-Vegetarian) Meal: No beef/veal; contains other types of meat, may include pork
Vegetarian Meals
Raw Vegetarian Meal: Only fruits and vegetables
Asian Vegetarian – Oriental: No meat of any sort; can contain dairy products; cooked Chinese-style
Asian Vegetarian - Indian (non-strict): No meat of any sort; can contain dairy products; cooked Indian-style
Indian Vegetarian: (strict; suitable for Jain) No meat of any sort; no onion/garlic/ginger/all root vegetables; cooked Indian-style
Western Vegetarian (non-strict; ovo-lacto): No meat of any sort; can contain dairy products; cooked Western-style
Western Vegetarian (strict): No meat of any sort; no dairy products; cooked Western-style

Medical Meals

Bland Meal: No "irritants" (e.g. black pepper, chilli powder, caffeine, cocoa, alcohol)
Diabetic Meal: No sugar; limited salt
Fat Free Meal: No fats/fried foods/dairy products; preferred cooking styles are poaching/boiling
Fruit Platter Meal: Fresh fruits only
Gluten Free Meal: No wheat/rye/barley/oats in any form
High Fibre Meal: Contains items with high roughage (e.g. fruits/vegetables/wholegrain products/legumes/nuts); avoid white flour products/refined cereals
Low Sodium, No Salt Added Meal: Avoid naturally-salted/sodium-added processed foods (e.g. Baking powder/soda, MSG); no salt added during preparation
Low Calorie Meal: Limited fats/sauces/gravy/fried items; limited sugar-rich items
Low Fat/Cholesterol Meal: No animal fats but poly-unsaturated fatty acids allowed; limited fats/sauces/gravy fried items; no butter/cream/whole milk cheese; only lean meat allowed
Low Fibre/Residue Meal: Limited fibrous items (e.g. fruit/legumes/vegetables/wholegrain products)
Low Purine Meal: Avoid food with uric acid; Lots of fruits/vegetables recommended
Low Protein Meal: Limited meat and recommended protein weight less than 15 gm; limited eggs/dairy products/salt
Non-Carbohydrate Meal: No starch and carbohydrates in any form
Non-Lactose Meal: No lactose/dairy products (e.g. milk/milk solids/casein/cheese/cream/butter/margarine)
Soft Fluid Meal: Mainly sieved/soupy items
Semi Fluid Meal: Mainly pureed/minced/easily digestible items (e.g. pureed vegetables/potatoes/fruits, minced/homogenized meat, porridge/congee)
Ulcer Diet Meal: Contains easily digestive plain poached/broiled foods (e.g. white meat/fish); no acidic food/fruits

Infant & Child Meals

Baby Meal: Suitable for infants less than 1 year old; 1 jar each of main course, vegetables, and dessert
Post-weaning Meal: Suitable for infants between 1-2 years old; more substantial than Baby Meal; easy to bite/chew and digestible
Child Meal: Suitable for children between 2-7 years old; less substantial than adult meal; easy to bite/chew with items attractive to children

Other Meals

Seafood Meal: Meat used must be fish/other seafood only
Oriental Meal: Meal is cooked Chinese-style
Japanese Meal: First Class and available from Singapore and selected stations only