I have confirm it myself, that the idols indeed will often come to your restaurant, if you have the food they like.

Here is the information of foods they like and low energy recipe to 'lure' them.

3 Majesty

• Tsukasa Kirishima
  • Favorite food(s)
    • Health food
    • Appetizers
  • Unfavorite food(s)
    • Junk food
  • Low energy recipe(s)
    • Tonic water/トニックウォーター [-8 energy] +3 flowers

• Shinnosuke Otowa
  • Favorite food(s)
    • Sweets
  • Unfavorite food(s)
    • Spicy food
    • Cheese
  • Low energy recipe(s)
    • Vanilla ice-cream (cone)/バニラアイス(コーン) [-8 energy] +3 flowers
    • Cake muffin/ケーキマフィン [-8 energy] +3 flowers

• Kaito Tsuji
  • Favorite food(s)
    • Cheese
    • Japanese food
    • Spicy food
  • Unfavorite food(s)
    • Junk food
    • B-grade food
  • Low energy recipe(s)
    • Cheesecake (cut)/ チーズケーキ(カット) [–16 energy] +3 flowers
    • Mitarashi dango/みたらし団子 [-8 energy] +2 flowers
    • Tonic water/トニックウォーター [-8 energy] +2 flowers

X.I.P

• Kyoya Date
  • Favorite food(s)
    • Junk food
    • B-grade food
  • Unfavorite food(s)
    • Childish sweets
  • Low energy recipe(s)
    • Yakitori/焼き鳥 [-13 energy] +3 flowers
    • Hamburger/ハンバーガー [-14 energy] + 3 flowers

• Kento Fuwa
  • Favorite food(s)
    • Meat
  • Unfavorite food(s)
    • Sweets
  • Low energy recipe(s)
    • 牛丼 [-13 energy] + 3 flowers

• Toru Kanzaki
  • Favorite food(s)
    • Spicy Food
  • Unfavorite food(s)
    • Sweets
  • Low energy recipe(s)
    • Cola/コーラ-8 energy +2 flowers
    • For 3 flowers, the dishes are all 25 energy and above: Spicy Fried Rice, Mapo Tofu etc.)