1ounce in tiny tiny bites at a time, bite, chew, swallow, wait a couple minutes, another bite, and wait five minutes, try one more bite.
Start with chicken or tuna salad, cottage cheese, maybe scrambled eggs. Refried beans and a little melted cheese. Solid protein should be moistened or cooked in soup/broth, etc. Beef can be tough to digest, so try chicken thighs, soft white fish.