Good luck with the diet! Here are a couple sauces that you can add to whatever protein you like with some sauteed veg.
Here's a slight variation on a Rick Bayless sauce:
10-12 de-stemmed and de-seeded guajillo chiles
3-4 cloves of garlic
2-3 whole cloves
2 cans or 3 cups of beef stock
salt and pepper to taste
2 tablespoons oil
Take the chiles after removing stems and seeds, toast for 15-30 seconds per side in a hot pan, then cover with hot water and soak for 20 minutes.
Drain and add to a blender with garlic and cloves. Blend to a paste (if needed, use a little of the beef stock if it gets too thick)
Once blended, add oil to a hot pan, and then add the paste you created to fry until it becomes brick red. Then add beef broth. Taste for salt and pepper.
You can strain the sauce at this point, but I don't feel it's all that necessary. You can also adjust the amount of chiles depending on how hot you want it.
It'll be ready to go, and you can freeze or refrigerate any leftovers.
Next is a Thai chile sauce:
2 tablespoons brown sugar
2 tablespoons rice vinegar
2 tablespoons fish sauce
2 tablespoons siracha
1-2 tablespoons water or stock
Combine all ingredients in a bowl and mix. Add to sauteed meat and veggies and let reduce. Siracha can be adjusted as well if you want it spicier or milder.
Last is a Thai red curry sauce:
3-5 red jalepenos (or you can substitute the guajillo sauce from earlier)
stems from 1 bunch of cilantro
10 cloves of garlic
1/4 cup fish sauce
2 tablespoons of oil
2 cans of coconut milk
Add garlic, peppers, and cilantro stems, and fish sauce to a blender (or someone may have mentioned a mortar and pestle for more authenticity), and puree until smooth. Add oil to hot pan, then add puree and fry for a minute or two. Add the coconut milk next, and stir together. Wouldn't call this the most healthy of sauces, but a little goes a long way, and it is very flavorful. This could also be used for the base of a soup, or just added as a sauce to whatever protein and veg you are cooking.
These are some of my favorites, hope they help.