Need advice: my father uses lard in our food, I feel stuck

Assalamu alaykum warahmatullahi wabarakatuh I converted a few months ago and alhamdulillah I'm trying my best to practice. I'm a Mexican woman and the only Muslim in my family, so I mostly keep my practice private. When I told them, they were hesitant and my dad in particular pressured me to abandon Islam. For now I avoid pork and alcohol and try not to cause waves, alhamdulillah that's been easier since I didn't enjoy many of the haram things anyway. My dad sometimes cooks really well, but he told me he puts lard in a lot of his dishes and won't stop even though he says he doesn't add pork when I ask. He also pressures me to eat, lies about ingredients, and makes fun of my diet, calling it "bs." If I try to make something for myself he gets angry and calls me ungrateful. I feel isolated and sad, even though I have Muslim friends who support me. Tomorrow he's making dinner and I found out it will have lard. I don't want to be yelled at if I refuse to eat, but I also feel guilty and upset at the thought of eating something impermissible. Any practical advice? How can I politely avoid eating without causing a big confrontation? Should I prepare a simple meal for myself in secret, explain my boundaries calmly, or involve a trusted relative to help? I would appreciate dua and tips on handling this with patience and wisdom. Jazakallah khair.