I think that creating an index on dishTypeId will drastically reduce query
time.
In db4o 8.0 and above it will probably look something like this:
(while creating configuration for ObjectContainer)
EmbeddedConfiguration embeddedConfiguration =
Db4oEmbedded.newConfiguration();
embeddedConfiguration.common().objectClass(Recipe.class).objectField("dishTypeId").indexed(true);
In older versions of db4o it looks very similar
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