Are custard tarts high in calories? The definitive nutritional guide
                                
                                
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                                    4 min read                                
                            
                                With a traditional Portuguese custard tart containing an average of 298 calories per 100 grams, it's clear they are a calorie-dense treat. The question of 'are custard tarts high in calories?' is best answered by looking at the combination of ingredients that make them so rich and satisfying.