In a bowl, mix lime juice, honey, soy sauce, curry, and peanut butter.
Transfer to a saucepan with coconut milk and heat over medium heat for 5 minutes, stirring constantly
Beef
Sauté the onions in a saucepan for 5 minutes in a little oil
Sear the meat and add the satay, nuoc mam, and pepper. Mix well.
Lower the heat to medium-low, add the tomatoes, cover, and simmer for 1 hour. After half an hour, don't hesitate to taste and add more nuoc mam if it's not salty enough. Increase the heat to medium.
Turn the heat to medium-high and remove the lid, let it reduce for 5 minutes while stirring