diff --git a/src/Domain/Entities/Dish.cs b/src/Domain/Entities/Dish.cs
index 5521f5a..9b31168 100644
--- a/src/Domain/Entities/Dish.cs
+++ b/src/Domain/Entities/Dish.cs
@@ -1,24 +1,28 @@
+using System.Text;
+
 namespace Domain.Entities;
 
 /// <summary>
 /// Блюдо из меню (GetMenu / MenuItem).
 /// </summary>
-public sealed class Dish
+public sealed record Dish(
+    string Id,
+    string Article,
+    string Name,
+    decimal Price,
+    bool IsWeighted,
+    string FullPath,
+    IReadOnlyList<string> Barcodes)
 {
-    public required string Id { get; init; }
-
-    /// <summary>
-    /// Артикул блюда. Используется при вводе заказа с клавиатуры.
-    /// </summary>
-    public required string Article { get; init; }
-
-    public required string Name { get; init; }
-
-    public decimal Price { get; init; }
-
-    public bool IsWeighted { get; init; }
-
-    public required string FullPath { get; init; }
-
-    public IReadOnlyList<string> Barcodes { get; init; } = [];
+    private bool PrintMembers(StringBuilder builder)
+    {
+        builder.Append($"Id = {Id}, ");
+        builder.Append($"Article = {Article}, ");
+        builder.Append($"Name = {Name}, ");
+        builder.Append($"Price = {Price}, ");
+        builder.Append($"IsWeighted = {IsWeighted}, ");
+        builder.Append($"FullPath = {FullPath}, ");
+        builder.Append($"Barcodes = [{string.Join(", ", Barcodes)}]");
+        return true;
+    }
 }
diff --git a/src/Domain/Entities/Order.cs b/src/Domain/Entities/Order.cs
index dd58510..5417bba 100644
--- a/src/Domain/Entities/Order.cs
+++ b/src/Domain/Entities/Order.cs
@@ -1,22 +1,18 @@
+using System.Text;
+
 namespace Domain.Entities;
 
 /// <summary>
 /// Заказ (SendOrder).
 /// </summary>
-public sealed class Order
+public sealed record Order(Guid Id, IReadOnlyList<OrderItem> Items)
 {
-    private readonly List<OrderItem> _items = [];
-
-    public Guid Id { get; }
-
-    public IReadOnlyCollection<OrderItem> Items => _items;
-
-    public Order(Guid? id = null)
+    public Order()
+        : this(Guid.NewGuid(), [])
     {
-        Id = id ?? Guid.NewGuid();
     }
 
-    public void AddItem(string id, decimal quantity)
+    public Order AddItem(string id, decimal quantity)
     {
         ArgumentException.ThrowIfNullOrWhiteSpace(id);
 
@@ -28,10 +24,15 @@ public sealed class Order
                 "Количество должно быть больше нуля.");
         }
 
-        _items.Add(new OrderItem
-        {
-            Id = id,
-            Quantity = quantity,
-        });
+        var items = Items.ToList();
+        items.Add(new OrderItem(id, quantity));
+        return this with { Items = items };
+    }
+
+    private bool PrintMembers(StringBuilder builder)
+    {
+        builder.Append($"Id = {Id}, ");
+        builder.Append($"Items = [{string.Join(", ", Items)}]");
+        return true;
     }
 }
diff --git a/src/Domain/Entities/OrderItem.cs b/src/Domain/Entities/OrderItem.cs
index 9f14fd1..09e3416 100644
--- a/src/Domain/Entities/OrderItem.cs
+++ b/src/Domain/Entities/OrderItem.cs
@@ -3,15 +3,4 @@ namespace Domain.Entities;
 /// <summary>
 /// Позиция заказа (SendOrder / MenuItems).
 /// </summary>
-public sealed class OrderItem
-{
-    /// <summary>
-    /// Идентификатор блюда на сервере (<see cref="Dish.Id"/>).
-    /// </summary>
-    public required string Id { get; init; }
-
-    /// <summary>
-    /// Количество. Для весовых блюд допускаются дробные значения.
-    /// </summary>
-    public decimal Quantity { get; init; }
-}
+public sealed record OrderItem(string Id, decimal Quantity);