You say in spanish, as well, "menú del día".
El menú
"Kids' menu" can be expressed as "menú de niños".
"La carta" or "el munú"
menú, carta, lista de platos
"Day" in Spanish is día. Note the accent mark above the "i".
De forma cotidiana.
The way you say Mothers Day in Spanish is "Dia de Madre".
¡Qué día!
Quel dia?
the same way - menu
'Lunch menu' in Spanish would be: 'menú de almuerzo'
One option is to say, "Qué sirven ustedes esta noche? literally, "What are you serving tonight?"