diff --git a/spring-modulith-events/spring-modulith-events-api/src/main/java/org/springframework/modulith/events/externalize/ExternalizationCallback.java b/spring-modulith-events/spring-modulith-events-api/src/main/java/org/springframework/modulith/events/externalize/ExternalizationCallback.java
new file mode 100644
index 000000000..9da3fd979
--- /dev/null
+++ b/spring-modulith-events/spring-modulith-events-api/src/main/java/org/springframework/modulith/events/externalize/ExternalizationCallback.java
@@ -0,0 +1,26 @@
+/*
+ * Copyright 2023 the original author or authors.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.springframework.modulith.events.externalize;
+
+import org.springframework.modulith.events.externalize.EventExternalizationConfiguration.RoutingTarget;
+
+/**
+ * @author Oliver Drotbohm
+ */
+@FunctionalInterface
+public interface ExternalizationCallback<T> {
+	void send(T infrastructure, RoutingTarget target, Object payload);
+}
diff --git a/spring-modulith-events/spring-modulith-events-core/src/test/java/org/springframework/modulith/events/config/FooTest.java b/spring-modulith-events/spring-modulith-events-core/src/test/java/org/springframework/modulith/events/config/FooTest.java
new file mode 100644
index 000000000..47388d2e3
--- /dev/null
+++ b/spring-modulith-events/spring-modulith-events-core/src/test/java/org/springframework/modulith/events/config/FooTest.java
@@ -0,0 +1,56 @@
+/*
+ * Copyright 2023 the original author or authors.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.springframework.modulith.events.config;
+
+import static org.assertj.core.api.Assertions.*;
+
+import org.junit.jupiter.api.Test;
+import org.springframework.context.annotation.AnnotationConfigApplicationContext;
+import org.springframework.context.annotation.Bean;
+
+/**
+ * @author Oliver Drotbohm
+ */
+public class FooTest {
+
+	@Test
+	void detectsGenericFromBeanDefinitionForLambdaDeclaration() {
+
+		try (var context = new AnnotationConfigApplicationContext(MyConfiguration.class)) {
+
+			var factory = context.getBeanFactory();
+			var names = factory.getBeanNamesForType(MyGeneric.class);
+
+			var definition = factory.getBeanDefinition(names[0]);
+			var type = definition.getResolvableType();
+
+			assertThat(type.as(MyGeneric.class).getGeneric(0).resolve(Object.class))
+					.isEqualTo(String.class);
+		}
+	}
+
+	interface MyGeneric<T> {
+		void myMethod(T parameter);
+	}
+
+	static class MyConfiguration {
+
+		@Bean
+		MyGeneric<String> foo() {
+			return (parameter) -> {};
+		}
+	}
+}