3 vietnamese pepper beef spinach Recipes

beef or 6 -8 oz buffalo rump roast, chopped sweet yellow onions, black pepper, divided, fish sauce, divided (nuoc mam or nam pla), cornstarch, vegetable oil or 2 tbsp peanut oil, divided, garlic, minced, fresh baby spinach leaves, cleaned and dried (about 4 cups worth; or rau muong instead of spinach), ripe roma tomatoes, sliced into thin wedges, hot cooked jasmine rice , for serving

chicken (any part you like , chopped into bite-sized pieces), fish sauce (patis), big can of pineapple chunks or tidbits (discard the juice), bell pepper (deseeded and chopped), garlic (minced ), big onion (chopped ), a bunch of spinach (chopped ), oyster sauce, beef broth (i used broth cubes), cornstarch, sugar, chili peppers (deseeded and chopped), cooking oil, salt